/*--------------------------------------------------------------------
 * guc.c
 *
 * Support for grand unified configuration scheme, including SET
 * command, configuration file, and command line options.
 * See src/backend/utils/misc/README for more information.
 *
 *
 * Portions Copyright (c) 2012-2014, TransLattice, Inc.
 * Copyright (c) 2000-2017, PostgreSQL Global Development Group
 * Written by Peter Eisentraut <peter_e@gmx.net>.
 *
 * IDENTIFICATION
 *	  src/backend/utils/misc/guc.c
 *
 *--------------------------------------------------------------------
 */
#include "postgres.h"

#include <ctype.h>
#include <float.h>
#include <math.h>
#include <limits.h>
#include <unistd.h>
#include <sys/stat.h>
#ifdef HAVE_SYSLOG
#include <syslog.h>
#endif

#include "access/atxact.h"
#include "access/commit_ts.h"
#include "access/gin.h"
#ifdef PGXC
#include "access/gtm.h"
#include "pgxc/pgxc.h"
#endif
#include "access/rmgr.h"
#include "access/transam.h"
#include "access/twophase.h"
#include "access/xact.h"
#include "access/xlog_internal.h"
#include "access/heapam_xlog.h"
#include "catalog/inplace_upgrade.h"
#include "catalog/namespace.h"
#include "catalog/pg_authid.h"
#include "commands/async.h"
#include "commands/prepare.h"
#include "commands/user.h"
#include "commands/vacuum.h"
#include "commands/variable.h"
#include "commands/trigger.h"
#include "commands/copysreh.h"
#include "funcapi.h"
#include "jit/jit.h"
#include "libpq/auth.h"
#include "libpq/be-fsstubs.h"
#include "libpq/libpq.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "optimizer/cost.h"
#include "optimizer/geqo.h"
#include "optimizer/paths.h"
#include "optimizer/planmain.h"
#include "optimizer/planner.h"
#include "optimizer/spm.h"
#include "parser/parse_expr.h"
#include "parser/parse_type.h"
#include "parser/parser.h"
#include "parser/scansup.h"
#include "pgstat.h"
#ifdef PGXC
#include "commands/tablecmds.h"
#include "commands/trigger.h"
#include "nodes/nodes.h"
#include "pgxc/execRemote.h"
#include "pgxc/locator.h"
#include "pgxc/planner.h"
#include "pgxc/poolmgr.h"
#include "pgxc/nodemgr.h"
#include "pgxc/xc_maintenance_mode.h"
#include "storage/procarray.h"
#endif
#ifdef XCP
#include "commands/sequence.h"
#include "parser/parse_utilcmd.h"
#include "pgxc/nodemgr.h"
#include "pgxc/squeue.h"
#include "utils/snapmgr.h"
#endif
#include "postmaster/autovacuum.h"
#include "postmaster/job_scheduler.h"
#include "postmaster/bgworker_internals.h"
#include "postmaster/bgwriter.h"
#include "postmaster/clean2pc.h"
#include "postmaster/postmaster.h"
#include "postmaster/syslogger.h"
#include "postmaster/walwriter.h"
#include "replication/logicallauncher.h"
#include "replication/slot.h"
#include "replication/syncrep.h"
#include "replication/walreceiver.h"
#include "replication/walsender.h"
#include "storage/bufmgr.h"
#include "storage/dsm_impl.h"
#include "storage/standby.h"
#include "storage/fd.h"
#include "storage/large_object.h"
#include "storage/pg_shmem.h"
#include "storage/proc.h"
#include "storage/predicate.h"
#include "tcop/tcopprot.h"
#include "tsearch/ts_cache.h"
#include "utils/builtins.h"
#include "utils/bytea.h"
#include "utils/guc_tables.h"
#include "utils/memutils.h"
#include "utils/numeric.h"
#include "utils/orcl_datetime_formatting.h"
#include "utils/pg_locale.h"
#include "utils/plancache.h"
#include "utils/portal.h"
#include "utils/ps_status.h"
#include "utils/rls.h"
#include "utils/snapmgr.h"
#include "utils/tzparser.h"
#include "utils/varlena.h"
#include "utils/xml.h"
#include "utils/syscache.h"
#ifdef __OPENTENBASE__
#include "optimizer/pathnode.h"
#include "optimizer/plancat.h"
#include "optimizer/planner.h"
#include "optimizer/subselect.h"
#include "postmaster/pgarch.h"
#include "parser/analyze.h"
#include "tcop/pquery.h"
#include "utils/selfuncs.h"
#include "utils/xact_whitebox.h"
#endif
#ifdef __AUDIT__
#include "audit/audit.h"
#include "postmaster/auditlogger.h"
#endif
#ifdef __AUDIT_FGA__
#include "audit/audit_fga.h"
#endif
#ifdef __STORAGE_SCALABLE__
#include "replication/logical_statistic.h"
#endif
#ifdef _MLS_
#include "utils/datamask.h"
#include "utils/mls.h"
#endif
#ifdef __OPENTENBASE_C__
#include "access/reloptions.h"
#include "access/result_cache.h"
#include "catalog/pg_package.h"
#include "executor/execFragment.h"
#include "executor/execLight.h"
#include "optimizer/memctl.h"
#include "optimizer/prep.h"
#include "forward/fnconn.h"
#endif
#include "catalog/pg_database.h"
#include "catalog/pg_profile.h"
#include "commands/dblinkcmds.h"
#ifdef __RESOURCE_QUEUE__
#include "commands/resqueue.h"
#include "executor/spi.h"
#endif
#include "utils/resgroup.h"
#include "utils/resgroup-ops.h"
#include "common/opentenbase_ora.h"

#ifndef PG_KRB_SRVTAB
#define PG_KRB_SRVTAB ""
#endif

#define CONFIG_FILENAME "postgresql.conf"
#define HBA_FILENAME	"pg_hba.conf"
#define IDENT_FILENAME	"pg_ident.conf"
#define EXPERIMENT_FEATURE_NAME "experiment_feature"

#ifdef EXEC_BACKEND
#define CONFIG_EXEC_PARAMS "global/config_exec_params"
#define CONFIG_EXEC_PARAMS_NEW "global/config_exec_params.new"
#endif

#ifndef __OPTIMIZE__
#include "utils/opentenbase_test.h"
#endif

/*
 * Precision with which REAL type guc values are to be printed for GUC
 * serialization.
 */
#define REALTYPE_PRECISION 17

/* XXX these should appear in other modules' header files */
extern bool Log_disconnections;
extern int	CommitDelay;
extern int	CommitSiblings;
extern char *default_tablespace;
extern char *temp_tablespaces;
extern bool ignore_checksum_failure;
extern bool ignore_invalid_pages;
extern bool synchronize_seqscans;
bool enable_skip_send_read_commited;
#ifdef TRACE_SYNCSCAN
extern bool trace_syncscan;
#endif
#ifdef DEBUG_BOUNDED_SORT
extern bool optimize_bounded_sort;
#endif

#ifdef __OPENTENBASE__
extern bool	   GTMDebugPrint;
extern bool    g_GTM_skip_catalog;
extern bool	   PoolerStuckExit;
extern BackendId CoordSessionBackendId;
extern bool    PlpgsqlDebugPrint;
/* used for get total size of session */
static int32 g_TotalMemorySize = 0;
extern int     global_deadlock_detector_mode;
extern int     global_deadlock_detector_period;
extern int	   log_min_duration_detection;
#endif

extern int calc_db_size_worker_num;
extern int calc_db_size_slice_num;


extern bool	postpone_slow_node;
extern bool	enable_simple_analyze;
extern int	hybrid_sort_mem;
extern bool	enable_hybrid_sort;
extern int	FnSenderDelay;
extern int	FnSendBulkSize;

extern int  fn_send_regiser_factor;
extern bool fn_recv_disk_cache;
extern bool record_text_plantree;
extern bool enable_pgxcnode_message;
extern bool record_history_messages;
extern bool delay_sending_begin;
extern bool backend_cn;
extern bool force_ignore_redo_missing;

extern bool enable_threadsafety_check;

/* inplace upgrade */
#define PROC_OID_LIST_LENGTH 2
#define TYPE_OID_LIST_LENGTH 4
#define CATALOG_OID_LIST_LENGTH 7
#define NAMESPACE_OID_LIST_LENGTH 2
#define GENERAL_OID_LIST_LENGTH 2

static int	GUC_check_errcode_value;
extern int	gts_track_segment;
extern int  default_sql_mode;
extern bool serveroutput;
extern int gts_cache_timeout;
extern int max_remote_query_fetch;
extern bool is_pooler_show_cmd;
extern bool unique_column_name;
extern double autovacuum_schema_cleanup_factor;

/* global variables for check hook support */
char	   *GUC_check_errmsg_string;
char	   *GUC_check_errdetail_string;
char	   *GUC_check_errhint_string;

/* Enable 2pc gts optimize? */
extern bool enable_2pc_gts_optimize;
bool enable_lateral_pull_up;
bool different_func_argret;
bool enable_opentenbase_ora_dist_udaf = false;
uint64 GucSubtxnId = 0;

/*
 * GUC variables.  This is a DIRECT violation of the warning given at the
 * head of gram.y, ie flex/bison code must not depend on any GUC variables;
 * as such, changing their values can induce very unintuitive behavior.
 * But we shall have to live with it until we can remove these variables.
 */
int			backslash_quote = BACKSLASH_QUOTE_SAFE_ENCODING;
bool		escape_string_warning = true;
bool        standard_conforming_strings = true;
bool        enable_lightweight_ora_syntax = false;
bool        enable_opentenbase_ora_column_name = false;
bool		enable_opentenbase_ora_implicit_coercion = true;
bool		enable_type_priority_in_ora_mode = true;
bool		enable_distinct_order_by = false;
bool		check_orderby_distinct = true;
/* Experimental GUC, added in 5.21.7.0 */
bool		allow_plsql_cross_used = true;

/* autoanalyze */
bool xact_autoanalyze = true;
int xact_autoanalyze_naptime = 0;
int xact_autoanalyze_mode;
/* Enable gts optimize? */
bool enable_gts_optimize = true;
bool enable_nestedtable_check = false;
bool default_interval_day_prec = false;
bool simplify_stable_function = false;
bool enable_opentenbase_ora_pkg_nested_table = false;
bool enable_function_overload = true;
bool enable_inline_target_function = false;
bool enable_create_package_rec_typ = false;
bool plpgsql_format_procedure_qualified = false;
bool only_rename_typobj_metainfo = false;
bool different_func_argret;
bool allow_unmatched_block_comments = false;
bool allow_type_nesting_error = false;

/* Enable opentenbase_ora UDAF in distributed mode? */

/* Is centralized mode? */
bool is_centralized_mode = false;

/* enable pushdown join clause into subquery */
bool		enable_push_pred = false;

/* Max planstate length for pg process */
int proc_max_planstate = 1024;

extern int max_result_cache_memory;
extern bool enable_scalar_subquery_cache;
extern int nestloop_deviation_factor;
extern int nestloop_deviation_threshold;
extern int nestloop_outer_rows_threshold;
extern int nestloop_inner_rows_threshold;
extern int hashjoin_inner_rows_factor;
extern int hashjoin_inner_rows_threshold;
bool allow_limit_ident;
extern bool skip_check_same_relname;
extern bool enable_opentenbase_ora_return_type;
bool enable_right_nvl_typmod;

/* unused guc */
bool obsolete_bool_guc = false;
int  obsolete_int_guc = 0;

/* Some string type guc value may contain ident, need to convert it to uppercase */
static inline bool str_val_contain_ident(const char *name);
static void do_serialize(char **destptr, Size *maxbytes, const char *fmt,...) pg_attribute_printf(3, 4);
static void set_config_sourcefile(const char *name, char *sourcefile,
					  int sourceline);
static bool call_bool_check_hook(struct config_bool *conf, bool *newval,
					 void **extra, GucSource source, int elevel);
static bool call_int_check_hook(struct config_int *conf, int *newval,
					void **extra, GucSource source, int elevel);
static bool call_real_check_hook(struct config_real *conf, double *newval,
					 void **extra, GucSource source, int elevel);
static bool call_string_check_hook(struct config_string *conf, char **newval,
					   void **extra, GucSource source, int elevel);
static bool call_enum_check_hook(struct config_enum *conf, int *newval,
					 void **extra, GucSource source, int elevel);

static bool check_log_destination(char **newval, void **extra, GucSource source);
static void assign_log_destination(const char *newval, void *extra);

static bool check_wal_consistency_checking(char **newval, void **extra,
							   GucSource source);
static void assign_wal_consistency_checking(const char *newval, void *extra);

#ifdef HAVE_SYSLOG
static int	syslog_facility = LOG_LOCAL0;
#else
static int	syslog_facility = 0;
#endif

static void assign_syslog_facility(int newval, void *extra);
static void assign_syslog_ident(const char *newval, void *extra);
static void assign_session_replication_role(int newval, void *extra);
static bool check_temp_buffers(int *newval, void **extra, GucSource source);
static bool check_bonjour(bool *newval, void **extra, GucSource source);
static bool check_ssl(bool *newval, void **extra, GucSource source);
static bool check_stage_log_stats(bool *newval, void **extra, GucSource source);
static bool check_log_stats(bool *newval, void **extra, GucSource source);
#ifdef PGXC
static bool check_pgxc_maintenance_mode(bool *newval, void **extra, GucSource source);
#endif
static bool check_centralized_mode(bool *newval, void **extra, GucSource source);
static bool check_canonical_path(char **newval, void **extra, GucSource source);
static bool check_timezone_abbreviations(char **newval, void **extra, GucSource source);
static void assign_timezone_abbreviations(const char *newval, void *extra);
static void pg_timezone_abbrev_initialize(void);
static const char *show_archive_command(void);
static void assign_tcp_keepalives_idle(int newval, void *extra);
static void assign_tcp_keepalives_interval(int newval, void *extra);
static void assign_tcp_keepalives_count(int newval, void *extra);
static void assign_tcp_user_timeout(int newval, void *extra);
static const char *show_tcp_keepalives_idle(void);
static const char *show_tcp_keepalives_interval(void);
static const char *show_tcp_keepalives_count(void);
static const char *show_tcp_user_timeout(void);
static bool check_maxconnections(int *newval, void **extra, GucSource source);
static bool check_max_worker_processes(int *newval, void **extra, GucSource source);
static bool check_autovacuum_max_workers(int *newval, void **extra, GucSource source);
static bool check_autovacuum_work_mem(int *newval, void **extra, GucSource source);
static bool check_effective_io_concurrency(int *newval, void **extra, GucSource source);
static void assign_effective_io_concurrency(int newval, void *extra);
static void assign_pgstat_temp_directory(const char *newval, void *extra);
static bool check_application_name(char **newval, void **extra, GucSource source);
static void assign_application_name(const char *newval, void *extra);
static bool check_cluster_name(char **newval, void **extra, GucSource source);
static const char *show_unix_socket_permissions(void);
static const char *show_log_file_mode(void);
static bool is_experiment_guc(struct config_generic *record);
static bool check_unused_bool_guc_set(bool *newval, void **extra, GucSource source);
static bool check_unused_int_guc_set(int *newval, void **extra, GucSource source);
static bool should_send_to_nodes(const char *name,  GucSource source, GucAction action);
#ifdef __AUDIT__
static const char *show_alog_file_mode(void);
#endif


/* Private functions in guc-file.l that need to be called from guc.c */
static ConfigVariable *ProcessConfigFileInternal(GucContext context,
						  bool applySettings, int elevel);

#ifdef XCP
static void strreplace_all(char *str, char *needle, char *replacement);
#endif

#ifdef __OPENTENBASE__
static bool set_warm_shared_buffer(bool *newval, void **extra, GucSource source);
static const char *show_total_memorysize(void);
static bool check_query_mem(int *newval, void **extra, GucSource source);
static void assign_query_mem(int newval, void *extra);
static bool check_max_query_mem(int *newval, void **extra, GucSource source);
static void assign_max_query_mem(int newval, void *extra);
static const char *show_global_trace_id(void);
#endif

#ifdef _MLS_
static void assign_default_locator_type(const char *newval, void *extra);
#endif

static bool check_resource_group_bypass(bool *newval, void **extra, GucSource source);
static bool check_enable_resource_group(bool *newval, void **extra, GucSource source);
static void assign_enable_resource_group(bool newval, void *extra);
static void assign_resource_group_name(const char *newval, void *extra);
static bool check_resource_group_leader_coordinator(char **newval, void **extra, GucSource source);
static bool check_max_handles(int *newval, void **extra, GucSource source);
static void assign_max_handles(int newval, void *extra);


/* inplace upgrade */
static bool check_default_transaction_read_only(bool* newval, void** extra, GucSource source);
static bool check_is_upgrade(bool* newval, void** extra, GucSource source);
static void assign_inplace_upgrade(const bool newval, void* extra);
static bool check_and_assign_catalog_oids(List* elemlist);
static bool check_and_assign_proc_oids(List* elemlist);
static bool check_and_assign_type_oids(List* elemlist);
static bool check_and_assign_namespace_oids(List* elemlist);
static bool check_and_assign_general_oids(List* elemlist);
static bool check_inplace_upgrade_next_oids(char** newval, void** extra, GucSource source);

static bool check_page_checksums(bool *newval, void **extra, GucSource source);
static void quote_restrict_rel_kind(StringInfo command, char *name, const char *value, bool local);

/*
 * Options for enum values defined in this module.
 *
 * NOTE! Option values may not contain double quotes!
 */

static const struct config_enum_entry bytea_output_options[] = {
	{"escape", BYTEA_OUTPUT_ESCAPE, false},
	{"hex", BYTEA_OUTPUT_HEX, false},
	{NULL, 0, false}
};
/* There are risks in setting parameters dynamic, so use PACKAGE_LINK_DEPENDENT */
static const struct config_enum_entry pkg_lk_options[] = {
	{"dependent", PACKAGE_LINK_DEPENDENT, false},
	{"dynamic", PACKAGE_LINK_DEPENDENT, true},
	{NULL, 0, false}
};

/*
 * We have different sets for client and server message level options because
 * they sort slightly different (see "log" level)
 */
static const struct config_enum_entry client_message_level_options[] = {
	{"debug", DEBUG2, true},
	{"debug5", DEBUG5, false},
	{"debug4", DEBUG4, false},
	{"debug3", DEBUG3, false},
	{"debug2", DEBUG2, false},
	{"debug1", DEBUG1, false},
	{"log", LOG, false},
	{"info", INFO, true},
	{"notice", NOTICE, false},
	{"warning", WARNING, false},
	{"error", ERROR, false},
	{"fatal", FATAL, true},
	{"panic", PANIC, true},
	{NULL, 0, false}
};

static const struct config_enum_entry server_message_level_options[] = {
	{"debug", DEBUG2, true},
	{"debug5", DEBUG5, false},
	{"debug4", DEBUG4, false},
	{"debug3", DEBUG3, false},
	{"debug2", DEBUG2, false},
	{"debug1", DEBUG1, false},
	{"info", INFO, false},
	{"notice", NOTICE, false},
	{"warning", WARNING, false},
	{"error", ERROR, false},
	{"log", LOG, false},
	{"fatal", FATAL, false},
	{"panic", PANIC, false},
	{NULL, 0, false}
};

static const struct config_enum_entry intervalstyle_options[] = {
	{"postgres", INTSTYLE_POSTGRES, false},
	{"postgres_verbose", INTSTYLE_POSTGRES_VERBOSE, false},
	{"sql_standard", INTSTYLE_SQL_STANDARD, false},
	{"iso_8601", INTSTYLE_ISO_8601, false},
	{NULL, 0, false}
};

static const struct config_enum_entry log_error_verbosity_options[] = {
	{"terse", PGERROR_TERSE, false},
	{"default", PGERROR_DEFAULT, false},
	{"verbose", PGERROR_VERBOSE, false},
	{NULL, 0, false}
};

static const struct config_enum_entry log_statement_options[] = {
	{"none", LOGSTMT_NONE, false},
	{"ddl", LOGSTMT_DDL, false},
	{"mod", LOGSTMT_MOD, false},
	{"all", LOGSTMT_ALL, false},
	{NULL, 0, false}
};

static const struct config_enum_entry isolation_level_options[] = {
	{"serializable", XACT_SERIALIZABLE, false},
	{"repeatable read", XACT_REPEATABLE_READ, false},
	{"read committed", XACT_READ_COMMITTED, false},
	{"read uncommitted", XACT_READ_UNCOMMITTED, false},
	{NULL, 0}
};

static const struct config_enum_entry session_replication_role_options[] = {
	{"origin", SESSION_REPLICATION_ROLE_ORIGIN, false},
	{"replica", SESSION_REPLICATION_ROLE_REPLICA, false},
	{"local", SESSION_REPLICATION_ROLE_LOCAL, false},
	{NULL, 0, false}
};

static const struct config_enum_entry syslog_facility_options[] = {
#ifdef HAVE_SYSLOG
	{"local0", LOG_LOCAL0, false},
	{"local1", LOG_LOCAL1, false},
	{"local2", LOG_LOCAL2, false},
	{"local3", LOG_LOCAL3, false},
	{"local4", LOG_LOCAL4, false},
	{"local5", LOG_LOCAL5, false},
	{"local6", LOG_LOCAL6, false},
	{"local7", LOG_LOCAL7, false},
#else
	{"none", 0, false},
#endif
	{NULL, 0}
};

static const struct config_enum_entry track_function_options[] = {
	{"none", TRACK_FUNC_OFF, false},
	{"pl", TRACK_FUNC_PL, false},
	{"all", TRACK_FUNC_ALL, false},
	{NULL, 0, false}
};

static const struct config_enum_entry recovery_init_sync_method_options[] = {
		{"fsync", RECOVERY_INIT_SYNC_METHOD_FSYNC, false},
#ifdef HAVE_SYNCFS
		{"syncfs", RECOVERY_INIT_SYNC_METHOD_SYNCFS, false},
#endif
		{NULL, 0, false}
};

static const struct config_enum_entry xmlbinary_options[] = {
	{"base64", XMLBINARY_BASE64, false},
	{"hex", XMLBINARY_HEX, false},
	{NULL, 0, false}
};

static const struct config_enum_entry xmloption_options[] = {
	{"content", XMLOPTION_CONTENT, false},
	{"document", XMLOPTION_DOCUMENT, false},
	{NULL, 0, false}
};
/*
 * Although only "on", "off", and "safe_encoding" are documented, we
 * accept all the likely variants of "on" and "off".
 */
static const struct config_enum_entry backslash_quote_options[] = {
	{"safe_encoding", BACKSLASH_QUOTE_SAFE_ENCODING, false},
	{"on", BACKSLASH_QUOTE_ON, false},
	{"off", BACKSLASH_QUOTE_OFF, false},
	{"true", BACKSLASH_QUOTE_ON, true},
	{"false", BACKSLASH_QUOTE_OFF, true},
	{"yes", BACKSLASH_QUOTE_ON, true},
	{"no", BACKSLASH_QUOTE_OFF, true},
	{"1", BACKSLASH_QUOTE_ON, true},
	{"0", BACKSLASH_QUOTE_OFF, true},
	{NULL, 0, false}
};

/*
 * Although only "on", "off", and "partition" are documented, we
 * accept all the likely variants of "on" and "off".
 */
static const struct config_enum_entry constraint_exclusion_options[] = {
	{"partition", CONSTRAINT_EXCLUSION_PARTITION, false},
	{"on", CONSTRAINT_EXCLUSION_ON, false},
	{"off", CONSTRAINT_EXCLUSION_OFF, false},
	{"true", CONSTRAINT_EXCLUSION_ON, true},
	{"false", CONSTRAINT_EXCLUSION_OFF, true},
	{"yes", CONSTRAINT_EXCLUSION_ON, true},
	{"no", CONSTRAINT_EXCLUSION_OFF, true},
	{"1", CONSTRAINT_EXCLUSION_ON, true},
	{"0", CONSTRAINT_EXCLUSION_OFF, true},
	{NULL, 0, false}
};

#ifdef PGXC
/*
 * Define remote connection types for PGXC
 */
static const struct config_enum_entry pgxc_conn_types[] = {
	{"application", REMOTE_CONN_APP, false},
	{"coordinator", REMOTE_CONN_COORD, false},
	{"datanode", REMOTE_CONN_DATANODE, false},
#ifdef __OPENTENBASE_C__
	{"forward", REMOTE_CONN_FORWARDNODE, false},
#endif
	{"gtm", REMOTE_CONN_GTM, false},
	{"gtmproxy", REMOTE_CONN_GTM_PROXY, false},
	{NULL, 0, false}
};
#endif

/*
 * Although only "on", "off", "remote_apply", "remote_write", and "local" are
 * documented, we accept all the likely variants of "on" and "off".
 */
static const struct config_enum_entry synchronous_commit_options[] = {
	{"local", SYNCHRONOUS_COMMIT_LOCAL_FLUSH, false},
	{"remote_write", SYNCHRONOUS_COMMIT_REMOTE_WRITE, false},
	{"remote_apply", SYNCHRONOUS_COMMIT_REMOTE_APPLY, false},
	{"on", SYNCHRONOUS_COMMIT_ON, false},
	{"off", SYNCHRONOUS_COMMIT_OFF, false},
	{"true", SYNCHRONOUS_COMMIT_ON, true},
	{"false", SYNCHRONOUS_COMMIT_OFF, true},
	{"yes", SYNCHRONOUS_COMMIT_ON, true},
	{"no", SYNCHRONOUS_COMMIT_OFF, true},
	{"1", SYNCHRONOUS_COMMIT_ON, true},
	{"0", SYNCHRONOUS_COMMIT_OFF, true},
	{NULL, 0, false}
};

static const struct config_enum_entry track_memory_options[] = {
	{"off", TRACK_MEM_OFF, false},
	{"session", TRACK_MEM_SESSION, false},
	{"context", TRACK_MEM_CONTEXT, false},
	{NULL, 0, false}
};

static const struct config_enum_entry optimizer_capture_sql_plan_baselines_options[] = {
	{"off", SPM_CAPTURE_OFF, false},
	{"on", SPM_CAPTURE_ON, false},
	{NULL, 0, false}
};

static const struct config_enum_entry optimizer_use_sql_plan_baselines_options[] = {
	{"off", SPM_APPLY_OFF, false},
	{"on", SPM_APPLY_ON, false},
	{NULL, 0, false}
};

/*
 * Although only "on", "off", "try" are documented, we accept all the likely
 * variants of "on" and "off".
 */
static const struct config_enum_entry huge_pages_options[] = {
	{"off", HUGE_PAGES_OFF, false},
	{"on", HUGE_PAGES_ON, false},
	{"try", HUGE_PAGES_TRY, false},
	{"true", HUGE_PAGES_ON, true},
	{"false", HUGE_PAGES_OFF, true},
	{"yes", HUGE_PAGES_ON, true},
	{"no", HUGE_PAGES_OFF, true},
	{"1", HUGE_PAGES_ON, true},
	{"0", HUGE_PAGES_OFF, true},
	{NULL, 0, false}
};

#ifdef XCP
/*
 * Set global-snapshot source. 'gtm' is default, but user can choose
 * 'coordinator' for performance improvement at the cost of reduced consistency
 */
static const struct config_enum_entry global_snapshot_source_options[] = {
	{"gtm", GLOBAL_SNAPSHOT_SOURCE_GTM, true},
	{"coordinator", GLOBAL_SNAPSHOT_SOURCE_COORDINATOR, true},
	{NULL, 0, false}
};
#endif

static const struct config_enum_entry force_parallel_mode_options[] = {
	{"off", FORCE_PARALLEL_OFF, false},
	{"on", FORCE_PARALLEL_ON, false},
	{"regress", FORCE_PARALLEL_REGRESS, false},
	{"true", FORCE_PARALLEL_ON, true},
	{"false", FORCE_PARALLEL_OFF, true},
	{"yes", FORCE_PARALLEL_ON, true},
	{"no", FORCE_PARALLEL_OFF, true},
	{"1", FORCE_PARALLEL_ON, true},
	{"0", FORCE_PARALLEL_OFF, true},
	{NULL, 0, false}
};

static const struct config_enum_entry plan_cache_mode_options[] = {
	{"auto", PLAN_CACHE_MODE_AUTO, false},
	{"force_generic_plan", PLAN_CACHE_MODE_FORCE_GENERIC_PLAN, false},
	{"force_custom_plan", PLAN_CACHE_MODE_FORCE_CUSTOM_PLAN, false},
	{NULL, 0, false}
};

/*
 * password_encryption used to be a boolean, so accept all the likely
 * variants of "on", too. "off" used to store passwords in plaintext,
 * but we don't support that anymore.
 */
static const struct config_enum_entry password_encryption_options[] = {
	{"md5", PASSWORD_TYPE_MD5, false},
	{"scram-sha-256", PASSWORD_TYPE_SCRAM_SHA_256, false},
	{"on", PASSWORD_TYPE_MD5, true},
	{"true", PASSWORD_TYPE_MD5, true},
	{"yes", PASSWORD_TYPE_MD5, true},
	{"1", PASSWORD_TYPE_MD5, true},
	{NULL, 0, false}
};

#ifdef _SHARDING_
static const struct config_enum_entry shard_visible_modes[] = {
	{"visible", SHARD_VISIBLE_MODE_VISIBLE,false},
	{"hidden", SHARD_VISIBLE_MODE_HIDDEN, false},
	{"allin", SHARD_VISIBLE_MODE_ALL, false},
 	{NULL, 0, false}
 };
#endif

#ifdef __OPENTENBASE__
/*
 * Although only "break", "continue" are documented, we
 * accept all the likely variants of "on" and "off".
 */
static const struct config_enum_entry archive_status_control_options[] = {
    {"continue", ARCHSTATUS_CONTINUE, false},
    {"break", ARCHSTATUS_BREAK, false},
    {"on", ARCHSTATUS_CONTINUE, true},
    {"off", ARCHSTATUS_BREAK, true},
    {NULL, ARCHSTATUS_CONTINUE, true}
};

#endif

#ifdef USE_WHITEBOX_INJECTION
static const struct config_enum_entry whitebox_injection_failure_type_options[] = {
	{"inactive", WHITEBOX_INACTIVE, false},
	{"error", WHITEBOX_ERROR, false},
	{"fatal", WHITEBOX_FATAL, false},
	{"panic", WHITEBOX_PANIC, false},
	{"sleep", WHITEBOX_SLEEP, false},
	{NULL, WHITEBOX_INACTIVE, false}
};

static const struct config_enum_entry whitebox_injection_failure_node_options[] = {
	{"local_cn", LOCAL_CN, false},
	{"one_cn", ONE_CN, false},
	{"all_cn", ALL_CN, false},
	{"one_dn", ONE_DN, false},
	{"all_dn", ALL_DN, false},
	{"all_node", ALL_NODE, false},
	{NULL, ALL_NODE, false}
};
#endif

#ifdef __OPENTENBASE_C__
int default_rel_store = RELSTORE_ROW;
int default_rel_compression = COMPRESSION_TYPE_LOW;

static const struct config_enum_entry pgxc_plane_name_control_options[] = {
	{"opentenbase_cluster",  	 OpenTenBase_Cluster,    false},
	{"opentenbase_cluster_01", OpenTenBase_Cluster_01, false},
	{"opentenbase_cluster_02", OpenTenBase_Cluster_02, false},
	{"opentenbase_cluster_03", OpenTenBase_Cluster_03, false},
	{"opentenbase_cluster_04", OpenTenBase_Cluster_04, false},
	{"opentenbase_cluster_05", OpenTenBase_Cluster_05, false},
	{"opentenbase_cluster_06", OpenTenBase_Cluster_06, false},
	{"opentenbase_cluster_07", OpenTenBase_Cluster_07, false},
	{"opentenbase_cluster_08", OpenTenBase_Cluster_08, false},
	{"opentenbase_cluster_09", OpenTenBase_Cluster_09, false},
	{"opentenbase_cluster_10", OpenTenBase_Cluster_10, false},
	{"opentenbase_cluster_11", OpenTenBase_Cluster_11, false},
	{"opentenbase_cluster_12", OpenTenBase_Cluster_12, false},
	{"opentenbase_cluster_13", OpenTenBase_Cluster_13, false},
	{"opentenbase_cluster_14", OpenTenBase_Cluster_14, false},
	{"opentenbase_cluster_15", OpenTenBase_Cluster_15, false},
	{NULL, 				 OpenTenBase_Cluster,    false}
};

static const struct config_enum_entry default_sql_mode_options[] = {
	{"postgresql",   SQLMODE_POSTGRESQL, false},
	{"opentenbase_ora",       SQLMODE_OPENTENBASE_ORA,     false},
	{NULL,           SQLMODE_NULL,       true}
};

static const struct config_enum_entry trigger_execmode_options[] = {
	{"pushdown", TRIG_EXECMODE_PUSHDOWN, false},
	{"pullup", TRIG_EXECMODE_PULLUP, false},
	{"auto", TRIG_EXECMODE_AUTO, false},
	{NULL, TRIG_EXECMODE_AUTO, false}
};
#endif

static const struct config_enum_entry advance_verification_actions[] = {
	{"none", VERIFY_ACTION_NONE, false},
	{"test", VERIFY_ACTION_TEST, true},
	{"warning", VERIFY_ACTION_WARNING, false},
	{"error", VERIFY_ACTION_ERROR, false},
	{"panic", VERIFY_ACTION_PANIC, false},
	{NULL, VERIFY_ACTION_NONE, false}
};

static const struct config_enum_entry autoanalyze_option[] = {
	{"dml", ANALYZE_AFTER_DML, false},
	{"use", ANALYZE_BEFORE_USE, false},
	{"mix", ANALYZE_TWO_CONDITION, false},
	{NULL, ANALYZE_AFTER_DML, false}
};

static const struct config_enum_entry force_assign_xid_option[] = {
	{"stop_assign", NOT_ASSIGN_RESERVED_XID, false},
	{"user_run", USER_RUN_SQL, false},
	{"dba_freeze", DBA_RUN_FREEZE, false},
	{NULL, NOT_ASSIGN_RESERVED_XID, false}
};

static const struct config_enum_entry csnlog_compress_option[] = {
    {"not_compress", NOT_COMPRESSD, false},
    {"rename_file", RENAME_FOR_BACKUP, false},
    {"remove_when_error", REMOVED_WHEN_ERROR, false},
    {"rename_when_error", RENAMED_WHEN_ERROR, false},
    {NULL, NOT_COMPRESSD, false}

};

/*
 * Options for enum values stored in other modules
 */
extern const struct config_enum_entry wal_level_options[];
extern const struct config_enum_entry archive_mode_options[];
extern const struct config_enum_entry sync_method_options[];
extern const struct config_enum_entry dynamic_shared_memory_options[];

/*
 * GUC option variables that are exported from this module
 */
bool		compute_query_id = false;
bool		log_duration = false;
bool		Debug_print_plan = false;
bool		Debug_print_parse = false;
bool		Debug_print_rewritten = false;
bool		Debug_pretty_print = true;
#ifdef __OPENTENBASE__
bool		Debug_print_plan_on_error = false;
#endif

bool		log_parser_stats = false;
bool		log_planner_stats = false;
bool		log_executor_stats = false;
bool		log_statement_stats = false;	/* this is sort of all three above
											 * together */
#ifdef XCP
bool		log_gtm_stats = false;
bool		log_remotesubplan_stats = false;
#endif

bool		log_btree_build_stats = false;
char	   *event_source;

bool		row_security;
bool		check_function_bodies = true;
bool		check_function_pludt = true;
bool		default_with_oids = false;
bool		session_auth_is_superuser;

#ifdef _SHARDING_
bool		default_has_extent = false;
#endif
#ifdef _PG_ORCL_
bool enable_secfunc_xact = false;
bool		datanode_local_plan = false;
bool		plpgsql_hold_cursor = true;
bool		default_with_rowid = false;
bool		pullup_outer_agg = false;
bool		skip_mls_etc = false;
bool		allow_limit_ident = false;
bool		disable_empty_to_null = false;
bool		convert_sysview_to_sysclass = true;
bool		plsql_emptystring_to_blank = true;
bool 		plsql_enable_savepoint = false;
bool 		plsql_stmt_level_rollback = false;
bool 		stmt_level_rollback = false;
bool 		select_into_empty = false;
#endif
#ifdef _MLS_
bool		g_CheckPassword = true;
char *      g_default_locator_type = NULL;
#endif

#ifdef _PUB_SUB_RELIABLE_
bool        g_replication_slot_debug = false;
#endif

#ifdef __OPENTENBASE__
int         query_delay = 0;
#endif

#ifdef __OPENTENBASE__
/* The threshold of columns number when use hash table */
int         hash_search_columns_threshold = 0;
#endif

int			log_min_error_statement = ERROR;
int			log_min_messages = WARNING;
int			client_min_messages = NOTICE;
int			log_min_duration_statement = -1;
int			log_temp_files = -1;
int			trace_recovery_messages = LOG;

int			temp_file_limit = -1;

int			num_temp_buffers = 1024;

char	   *cluster_name = "";
char	   *ConfigFileName;
char	   *HbaFileName;
char	   *IdentFileName;
char	   *external_pid_file;

char	   *pgstat_temp_directory;

char	   *application_name;

/*
 * Below are the default datetime formats in opentenbase_ora 19c, but they are 
 * unintuitive, so more intuitive and common formats are set as default.
 * 
 *     nls_date_format 		   - "DD-MON-RR"
 *     nls_timestamp_format    - "DD-MON-RR HH.MI.SSXFF AM"
 *     nls_timestamp_tz_format - "DD-MON-RR HH.MI.SSXFF AM TZR"
 *     nls_date_language       - "American"
 */
char	   *nls_date_format = "YYYY-MM-DD HH24:MI:SS";
char	   *nls_timestamp_format = "YYYY-MM-DD HH24:MI:SS.US";
char	   *nls_timestamp_tz_format = "YYYY-MM-DD HH24:MI:SS.US TZH:TZM";
char	   *nls_sort_locale = NULL;
char	   *nls_date_language = "American";

int			tcp_keepalives_idle;
int			tcp_keepalives_interval;
int			tcp_keepalives_count;
int			tcp_user_timeout;

/*
 * SSL renegotiation has been removed in PostgreSQL 9.5, but we tolerate it
 * being set to zero (meaning never renegotiate) for backward compatibility.
 * This avoids breaking compatibility with clients that have never supported
 * renegotiation and therefore always try to zero it.
 */
int			ssl_renegotiation_limit;

/*
 * This really belongs in pg_shmem.c, but is defined here so that it doesn't
 * need to be duplicated in all the different implementations of pg_shmem.c.
 */
int			huge_pages;

/* ignore INTO error-table clauses for backwards compatibility */
bool		tdx_ignore_error_table = false;
int 		tdx_external_max_segs = 256;

int		writable_external_table_bufsize = 16384;

int logical_apply_time_delay = 0;
int logical_apply_cache_capacity = 0;
/*
 * These variables are all dummies that don't do anything, except in some
 * cases provide the value for SHOW to display.  The real state is elsewhere
 * and is kept in sync by assign_hooks.
 */
static char *syslog_ident_str;
static double phony_random_seed;
static char *client_encoding_string;
static char *datestyle_string;
static char *locale_collate;
static char *locale_ctype;
static char *server_encoding_string;
static char *server_version_string;
static int	server_version_num;
static char *timezone_string;
static char *log_timezone_string;
static char *timezone_abbreviations_string;
static char *XactIsoLevel_string;
static char *data_directory;
static char *session_authorization_string;
static int	max_function_args;
static int	max_index_keys;
static int	max_identifier_length;
static int	block_size;
static int	segment_size;
static int	wal_block_size;
static bool data_checksums;
static int	wal_segment_size;
static bool integer_datetimes;
static bool assert_enabled;
static char *restrict_nonsystem_relation_kind_string;

bool over_as_alias = true;
bool case_as_alias = true;
/* Experimental GUC, added in 5.21.6.1 */
bool keywords_as_ident = false;
bool do_as_alias = true;
bool level_as_alias = false;
bool using_as_column_name = false;
bool currenttime_as_column_name = false;
/* opentenbase_ora: enable static code analysis in PL/SQL */
bool enable_plsql_analysis = false;
bool plsql_analysis_strictly = false;
bool page_checksums = true;
bool checksum_ddl_default = false;
bool intransaction_purne = false;
bool enable_auto_pushdown_function = false;
bool enable_unsafe_function_pushdown = false;
bool enable_unshippable_function_rewrite = false;

/* should be static, but commands/variable.c needs to get at this */
char	   *role_string;

#ifdef XCP
char *global_session_string;
#endif
#ifdef _MLS_
static bool g_is_mls_or_audit_user;
static bool g_is_inner_conn;
#endif
bool g_enable_copy_silence = false;
bool plpgsql_contenxt_line_num_print = true;
bool experiment_feature = false;
bool enable_benchmark_execution = false;
bool enable_experiment_isolation = false;

/*
 * Displayable names for context types (enum GucContext)
 *
 * Note: these strings are deliberately not localized.
 */
const char *const GucContext_Names[] =
{
	 /* PGC_INTERNAL */ "internal",
	 /* PGC_POSTMASTER */ "postmaster",
	 /* PGC_SIGHUP */ "sighup",
	 /* PGC_SU_BACKEND */ "superuser-backend",
	 /* PGC_BACKEND */ "backend",
	 /* PGC_SUSET */ "superuser",
	 /* PGC_USERSET */ "user"
};

/*
 * Displayable names for source types (enum GucSource)
 *
 * Note: these strings are deliberately not localized.
 */
const char *const GucSource_Names[] =
{
	 /* PGC_S_DEFAULT */ "default",
	 /* PGC_S_DYNAMIC_DEFAULT */ "default",
	 /* PGC_S_ENV_VAR */ "environment variable",
	 /* PGC_S_FILE */ "configuration file",
	 /* PGC_S_ARGV */ "command line",
	 /* PGC_S_GLOBAL */ "global",
	 /* PGC_S_DATABASE */ "database",
	 /* PGC_S_USER */ "user",
	 /* PGC_S_DATABASE_USER */ "database user",
	 /* PGC_S_CLIENT */ "client",
	 /* PGC_S_RESGROUP */ "resource group",
	 /* PGC_S_OVERRIDE */ "override",
	 /* PGC_S_INTERACTIVE */ "interactive",
	 /* PGC_S_TEST */ "test",
	 /* PGC_S_SESSION */ "session"
};

/*
 * Displayable names for the groupings defined in enum config_group
 */
const char *const config_group_names[] =
{
	/* UNGROUPED */
	gettext_noop("Ungrouped"),
	/* FILE_LOCATIONS */
	gettext_noop("File Locations"),
	/* CONN_AUTH */
	gettext_noop("Connections and Authentication"),
	/* CONN_AUTH_SETTINGS */
	gettext_noop("Connections and Authentication / Connection Settings"),
	/* CONN_AUTH_SECURITY */
	gettext_noop("Connections and Authentication / Security and Authentication"),
	/* RESOURCES */
	gettext_noop("Resource Usage"),
	/* RESOURCES_MEM */
	gettext_noop("Resource Usage / Memory"),
	/* RESOURCES_DISK */
	gettext_noop("Resource Usage / Disk"),
	/* RESOURCES_KERNEL */
	gettext_noop("Resource Usage / Kernel Resources"),
	/* RESOURCES_VACUUM_DELAY */
	gettext_noop("Resource Usage / Cost-Based Vacuum Delay"),
	/* RESOURCES_BGWRITER */
	gettext_noop("Resource Usage / Background Writer"),
	/* RESOURCES_ASYNCHRONOUS */
	gettext_noop("Resource Usage / Asynchronous Behavior"),
	/* WAL */
	gettext_noop("Write-Ahead Log"),
	/* WAL_SETTINGS */
	gettext_noop("Write-Ahead Log / Settings"),
	/* WAL_CHECKPOINTS */
	gettext_noop("Write-Ahead Log / Checkpoints"),
	/* WAL_ARCHIVING */
	gettext_noop("Write-Ahead Log / Archiving"),
	/* REPLICATION */
	gettext_noop("Replication"),
	/* REPLICATION_SENDING */
	gettext_noop("Replication / Sending Servers"),
	/* REPLICATION_MASTER */
	gettext_noop("Replication / Master Server"),
	/* REPLICATION_STANDBY */
	gettext_noop("Replication / Standby Servers"),
	/* REPLICATION_SUBSCRIBERS */
	gettext_noop("Replication / Subscribers"),
	/* QUERY_TUNING */
	gettext_noop("Query Tuning"),
	/* QUERY_TUNING_METHOD */
	gettext_noop("Query Tuning / Planner Method Configuration"),
	/* QUERY_TUNING_COST */
	gettext_noop("Query Tuning / Planner Cost Constants"),
	/* QUERY_TUNING_GEQO */
	gettext_noop("Query Tuning / Genetic Query Optimizer"),
	/* QUERY_TUNING_OTHER */
	gettext_noop("Query Tuning / Other Planner Options"),
	/* LOGGING */
	gettext_noop("Reporting and Logging"),
	/* LOGGING_WHERE */
	gettext_noop("Reporting and Logging / Where to Log"),
	/* LOGGING_WHEN */
	gettext_noop("Reporting and Logging / When to Log"),
	/* LOGGING_WHAT */
	gettext_noop("Reporting and Logging / What to Log"),
	/* PROCESS_TITLE */
	gettext_noop("Process Title"),
	/* STATS */
	gettext_noop("Statistics"),
	/* STATS_MONITORING */
	gettext_noop("Statistics / Monitoring"),
	/* STATS_COLLECTOR */
	gettext_noop("Statistics / Query and Index Statistics Collector"),
	/* AUTOVACUUM */
	gettext_noop("Autovacuum"),
	/* PGJOB */
	gettext_noop("PGJOB"),
	/* CLIENT_CONN */
	gettext_noop("Client Connection Defaults"),
	/* CLIENT_CONN_STATEMENT */
	gettext_noop("Client Connection Defaults / Statement Behavior"),
	/* CLIENT_CONN_LOCALE */
	gettext_noop("Client Connection Defaults / Locale and Formatting"),
	/* CLIENT_CONN_PRELOAD */
	gettext_noop("Client Connection Defaults / Shared Library Preloading"),
	/* CLIENT_CONN_OTHER */
	gettext_noop("Client Connection Defaults / Other Defaults"),
	/* LOCK_MANAGEMENT */
	gettext_noop("Lock Management"),
	/* COMPAT_OPTIONS */
	gettext_noop("Version and Platform Compatibility"),
	/* COMPAT_OPTIONS_PREVIOUS */
	gettext_noop("Version and Platform Compatibility / Previous PostgreSQL Versions"),
	/* COMPAT_OPTIONS_CLIENT */
	gettext_noop("Version and Platform Compatibility / Other Platforms and Clients"),
	/* ERROR_HANDLING */
	gettext_noop("Error Handling"),
	/* PRESET_OPTIONS */
	gettext_noop("Preset Options"),
	/* CUSTOM_OPTIONS */
	gettext_noop("Customized Options"),
	/* UPGRADE_OPTIONS */
	gettext_noop("Upgrade Options"),
	/* SHARD_VISIBLE_MODE */
	gettext_noop("Shard visible Options"),
	/* DEVELOPER_OPTIONS */
	gettext_noop("Developer Options"),
#ifdef PGXC
	/* DATA_NODES */
	gettext_noop("Datanodes and Connection Pooling"),
	/* GTM */
	gettext_noop("GTM Connection"),
	/* COORDINATORS */
	gettext_noop("Coordinator Options"),
	/* XC_HOUSEKEEPING_OPTIONS */
	gettext_noop("XC Housekeeping Options"),
#endif
	gettext_noop("opentenbase_ora Compatible Options"),
	/* CSNLOG_OPTIONS */
	gettext_noop("Csnlog Config Options"),
	gettext_noop("opentenbase_ora Compatible Shared in PG Mode Options"),
	/* help_config wants this array to be null-terminated */
	NULL
};

/*
 * Displayable names for GUC variable types (enum config_type)
 *
 * Note: these strings are deliberately not localized.
 */
const char *const config_type_names[] =
{
	 /* PGC_BOOL */ "bool",
	 /* PGC_INT */ "integer",
	 /* PGC_REAL */ "real",
	 /* PGC_STRING */ "string",
	 /* PGC_ENUM */ "enum"
};

/*
 * Unit conversion tables.
 *
 * There are two tables, one for memory units, and another for time units.
 * For each supported conversion from one unit to another, we have an entry
 * in the table.
 *
 * To keep things simple, and to avoid intermediate-value overflows,
 * conversions are never chained.  There needs to be a direct conversion
 * between all units (of the same type).
 *
 * The conversions from each base unit must be kept in order from greatest
 * to smallest unit; convert_from_base_unit() relies on that.  (The order of
 * the base units does not matter.)
 */
#define MAX_UNIT_LEN		3	/* length of longest recognized unit string */

typedef struct
{
	char		unit[MAX_UNIT_LEN + 1]; /* unit, as a string, like "kB" or
										 * "min" */
	int			base_unit;		/* GUC_UNIT_XXX */
	int			multiplier;		/* If positive, multiply the value with this
								 * for unit -> base_unit conversion.  If
								 * negative, divide (with the absolute value) */
} unit_conversion;

/* Ensure that the constants in the tables don't overflow or underflow */
#if BLCKSZ < 1024 || BLCKSZ > (1024*1024)
#error BLCKSZ must be between 1KB and 1MB
#endif
#if XLOG_BLCKSZ < 1024 || XLOG_BLCKSZ > (1024*1024)
#error XLOG_BLCKSZ must be between 1KB and 1MB
#endif
#if XLOG_SEG_SIZE < (1024*1024) || XLOG_SEG_SIZE > (1024*1024*1024)
#error XLOG_SEG_SIZE must be between 1MB and 1GB
#endif

static const char *memory_units_hint = gettext_noop("Valid units for this parameter are \"kB\", \"MB\", \"GB\", and \"TB\".");

static const unit_conversion memory_unit_conversion_table[] =
{
	{"TB", GUC_UNIT_KB, 1024 * 1024 * 1024},
	{"GB", GUC_UNIT_KB, 1024 * 1024},
	{"MB", GUC_UNIT_KB, 1024},
	{"kB", GUC_UNIT_KB, 1},
	{"KB", GUC_UNIT_KB, 1},

	{"TB", GUC_UNIT_MB, 1024 * 1024},
	{"GB", GUC_UNIT_MB, 1024},
	{"MB", GUC_UNIT_MB, 1},
	{"kB", GUC_UNIT_MB, -1024},
	{"KB", GUC_UNIT_MB, -1024},

	{"TB", GUC_UNIT_BLOCKS, (1024 * 1024 * 1024) / (BLCKSZ / 1024)},
	{"GB", GUC_UNIT_BLOCKS, (1024 * 1024) / (BLCKSZ / 1024)},
	{"MB", GUC_UNIT_BLOCKS, 1024 / (BLCKSZ / 1024)},
	{"kB", GUC_UNIT_BLOCKS, -(BLCKSZ / 1024)},
	{"KB", GUC_UNIT_BLOCKS, -(BLCKSZ / 1024)},

#ifdef __OPENTENBASE_C__
	{"TB", GUC_UNIT_COLBLOCKS, (1024 * 1024 * 1024) / (COL_BLCKSZ / 1024)},
	{"GB", GUC_UNIT_COLBLOCKS, (1024 * 1024) / (COL_BLCKSZ / 1024)},
	{"MB", GUC_UNIT_COLBLOCKS, 1024 / (COL_BLCKSZ / 1024)},
	{"kB", GUC_UNIT_COLBLOCKS, -(COL_BLCKSZ / 1024)},
	{"KB", GUC_UNIT_COLBLOCKS, -(COL_BLCKSZ / 1024)},
#endif

	{"TB", GUC_UNIT_XBLOCKS, (1024 * 1024 * 1024) / (XLOG_BLCKSZ / 1024)},
	{"GB", GUC_UNIT_XBLOCKS, (1024 * 1024) / (XLOG_BLCKSZ / 1024)},
	{"MB", GUC_UNIT_XBLOCKS, 1024 / (XLOG_BLCKSZ / 1024)},
	{"kB", GUC_UNIT_XBLOCKS, -(XLOG_BLCKSZ / 1024)},
	{"KB", GUC_UNIT_XBLOCKS, -(XLOG_BLCKSZ / 1024)},

	{""}						/* end of table marker */
};

static const char *time_units_hint = gettext_noop("Valid units for this parameter are \"ms\", \"s\", \"min\", \"h\", and \"d\".");

static const unit_conversion time_unit_conversion_table[] =
{
	{"d", GUC_UNIT_MS, 1000 * 60 * 60 * 24},
	{"h", GUC_UNIT_MS, 1000 * 60 * 60},
	{"min", GUC_UNIT_MS, 1000 * 60},
	{"s", GUC_UNIT_MS, 1000},
	{"ms", GUC_UNIT_MS, 1},

	{"d", GUC_UNIT_S, 60 * 60 * 24},
	{"h", GUC_UNIT_S, 60 * 60},
	{"min", GUC_UNIT_S, 60},
	{"s", GUC_UNIT_S, 1},
	{"ms", GUC_UNIT_S, -1000},

	{"d", GUC_UNIT_MIN, 60 * 24},
	{"h", GUC_UNIT_MIN, 60},
	{"min", GUC_UNIT_MIN, 1},
	{"s", GUC_UNIT_MIN, -60},
	{"ms", GUC_UNIT_MIN, -1000 * 60},

	{""}						/* end of table marker */
};

/*
 * Contents of GUC tables
 *
 * See src/backend/utils/misc/README for design notes.
 *
 * TO ADD AN OPTION:
 *
 * 1. Declare a global variable of type bool, int, double, or char*
 *	  and make use of it.
 *
 * 2. Decide at what times it's safe to set the option. See guc.h for
 *	  details.
 *
 * 3. Decide on a name, a default value, upper and lower bounds (if
 *	  applicable), etc.
 *
 * 4. Add a record below.
 *
 * 5. Add it to src/backend/utils/misc/postgresql.conf.sample, if
 *	  appropriate.
 *
 * 6. Don't forget to document the option (at least in config.sgml).
 *
 * 7. If it's a new GUC_LIST option you must edit pg_dumpall.c to ensure
 *	  it is not single quoted at dump time.
 */


/******** option records follow ********/

static struct config_bool ConfigureNamesBool[] =
{
	{
		{"default_interval_day_prec", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Set default interval DAY precision as opentenbase_ora, default DAY(2)."),
			NULL
		},
		&default_interval_day_prec,
		false,
		NULL, NULL, NULL
	},
	{
		{"simplify_stable_function", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("simplify to_char(sysdate, fmt)."),
			NULL
		},
		&simplify_stable_function,
		false,
		NULL,NULL,NULL
	},
	{
		{"enable_nestedtable_check", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Enables of checking changes of type in plpgsql."),
			NULL
		},
		&enable_nestedtable_check,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_seqscan", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of sequential-scan plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_seqscan,
		true,
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE_C__
	{
		{"datanode_local_plan", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Use local plan in datanode for replication table."),
			NULL
		},
		&datanode_local_plan,
		false,
		NULL, NULL, NULL
	},
#endif
	{
		{"enable_indexscan", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of index-scan plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_indexscan,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_global_indexscan", PGC_USERSET, QUERY_TUNING_METHOD,
		 gettext_noop("Enables the planner's use of global-index-scan plans."),
		 NULL
		},
		&enable_global_indexscan,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_indexonlyscan", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of index-only-scan plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_indexonlyscan,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_bitmapscan", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of bitmap-scan plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_bitmapscan,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_tidscan", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of TID scan plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_tidscan,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_sort", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of explicit sort steps."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_sort,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_hashagg", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of hashed aggregation plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_hashagg,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_pullup_target_casewhen", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables pulling up case when expression in target list."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_pullup_target_casewhen,
		true,
		NULL, NULL, NULL
	},

	{
		{"enable_pullup_expr_agg", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables pulling up expression subquery with aggregation."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_pullup_expr_agg,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_pullup_expr_distinct", PGC_USERSET, QUERY_TUNING_METHOD,
		 	gettext_noop("Enables pulling up expression subquery with distinct."),
		 	NULL,
		 	GUC_EXPLAIN
		},
		&enable_pullup_expr_distinct,
		true,
		NULL, NULL, NULL
	},

	{
		{"enable_check_scalar_join", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables pulling up expression subquery with aggregation."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_check_scalar_join,
		true,
		NULL, NULL, NULL
	},

	{
		{"enable_scalar_subquery_cache", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable cache scalar subquery results."),
			NULL
		},
		&enable_scalar_subquery_cache,
		false,
		NULL, NULL, NULL
	},

#ifdef __OPENTENBASE_C__
	{
		{"enable_sortagg", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of sorted aggregation plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_sortagg,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
#endif
	{
		{"hashagg_avoid_disk_plan", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Causes the planner to avoid hashed aggregation plans that are expected to use the disk."),
			NULL,
			GUC_EXPLAIN
		},
		&hashagg_avoid_disk_plan,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_material", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of materialization."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_material,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_nestloop", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of nested-loop join plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_nestloop,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"enable_nestloop_suppression", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the selectivity hints when planning nested-loop joins."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_nestloop_suppression,
		false,
		NULL, NULL, NULL
	},
	{
		{"is_centralized_mode", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Is centralized mode."),
			NULL,
			GUC_EXPLAIN
		},
		&is_centralized_mode,
		false,
		check_centralized_mode, NULL, NULL
	},
#endif
	{
		{"enable_mergejoin", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of merge join plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_mergejoin,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
	{
		{"enable_hashjoin", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of hash join plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_hashjoin,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_rightjoin", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of hash right join plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_rightjoin,
		true,
		NULL, NULL, NULL
	},
    {
        {"enable_right_semi_or_anti_join", PGC_USERSET, QUERY_TUNING_METHOD,
            gettext_noop("Enables the planner's use of right semi/anti join plans for hash join, nest loop join and merge join."),
            NULL,
            GUC_EXPLAIN
        },
        &enable_right_semi_or_anti_join,
        true,
        NULL, NULL, NULL
    },
#ifdef __OPENTENBASE_C__
	{
		{"enable_hashjoin_bloom", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the use of bloom filters in hash joins."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_hashjoin_bloom,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_conservative_selec", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the custom multi-col selectivity calc method."),
			NULL
		},
		&enable_conservative_selec,
		true,
		NULL, NULL, NULL
	},
#endif
	{
		{"enable_newhash", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of new hash function for hash join."),
			NULL
		},
		&enable_newhash,
		true,
		NULL, NULL, NULL
	},
#ifdef PGXC
	{
		{"enable_fast_query_shipping", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of fast query shipping to ship query directly to datanode."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_fast_query_shipping,
		true,
		NULL, NULL, NULL
	},
	{
		{"loose_constraints", PGC_USERSET, COORDINATORS,
			gettext_noop("Relax enforcing of constraints"),
			gettext_noop("If enabled then constraints like foreign keys "
						 "are not enforced. It's the users responsibility "
						 "to maintain referential integrity at the application "
						 "level")
		},
		&loose_constraints,
		false,
		NULL, NULL, NULL
	},
	{
		{"gtm_backup_barrier", PGC_SUSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables coordinator to report barrier id to GTM for backup."),
			NULL
		},
		&gtm_backup_barrier,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_datanode_row_triggers", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Enables datanode-only ROW triggers"),
			NULL
		},
		&enable_datanode_row_triggers,
		false,
		NULL, NULL, NULL
	},
	
#endif
	{
		{"enable_gathermerge", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of gather merge plans."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_gathermerge,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_partitionwise_join", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables partitionwise join."),
			NULL
		},
		&enable_partitionwise_join,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_parallel_append", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of parallel append plans."),
			NULL
		},
		&enable_parallel_append,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_parallel_hash", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's user of parallel hash plans."),
			NULL
		},
		&enable_parallel_hash,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_partition_pruning", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enable plan-time and run-time partition pruning."),
			gettext_noop("Allows the query planner and executor to compare partition "
						 "bounds to conditions in the query to determine which "
						 "partitions must be scanned.")
		},
		&enable_partition_pruning,
		true,
		NULL, NULL, NULL
	},
	{
		{"geqo", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("Enables genetic query optimization."),
			gettext_noop("This algorithm attempts to do planning without "
						 "exhaustive searching."),
			GUC_EXPLAIN
		},
		&enable_geqo,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_parallel_insert", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables the planner's use of parallel plans for INSERT commands."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_parallel_insert,
		true,
		NULL, NULL, NULL
	},
    {
        {"enable_parallel_update", PGC_USERSET, QUERY_TUNING_METHOD,
            gettext_noop("Enables the planner's use of parallel plans for UPDATE commands."),
            NULL,
            GUC_EXPLAIN
        },
        &enable_parallel_update,
        false,
        NULL, NULL, NULL
    },

    {
        {"enable_parallel_sequence", PGC_USERSET, QUERY_TUNING_METHOD,
             gettext_noop("Enables the planner's use of parallel plans for SEQUENCE."),
             NULL,
             GUC_EXPLAIN
        },
        &enable_parallel_sequence,
        false,
        NULL, NULL, NULL
    },

	{
		/* Not for general use --- used by SET SESSION AUTHORIZATION */
		{"is_superuser", PGC_INTERNAL, UNGROUPED,
			gettext_noop("Shows whether the current user is a superuser."),
			NULL,
			GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&session_auth_is_superuser,
		false,
		NULL, NULL, NULL
	},
#ifdef _MLS_
    {
		/* Not for general use --- used by SET SESSION AUTHORIZATION */
		{"is_mls_or_audit_user", PGC_INTERNAL, UNGROUPED,
			gettext_noop("Shows whether the current user is a mls or audit user."),
			NULL,
			GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&g_is_mls_or_audit_user,
		false,
		NULL, NULL, NULL
	},
	{
		/* Not for general use --- used by checking inner connection between pooler and nodes */
		{"inner_conn", PGC_USERSET, UNGROUPED,
			gettext_noop("inner connection between pooler and nodes."),
			NULL,
			GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&g_is_inner_conn,
		false,
		NULL, NULL, NULL
	},
#endif
	{
		{"bonjour", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Enables advertising the server via Bonjour."),
			NULL
		},
		&enable_bonjour,
		false,
		check_bonjour, NULL, NULL
	},
	{
		{"track_commit_timestamp", PGC_POSTMASTER, REPLICATION,
			gettext_noop("Collects transaction commit time."),
			NULL
		},
		&track_commit_timestamp,
		true,
		NULL, NULL, NULL
	},
	{
		{"ssl", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Enables SSL connections."),
			NULL
		},
		&EnableSSL,
		false,
		check_ssl, NULL, NULL
	},
	{
		{"ssl_prefer_server_ciphers", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Give priority to server ciphersuite order."),
			NULL
		},
		&SSLPreferServerCiphers,
		true,
		NULL, NULL, NULL
	},
	{
		{"fsync", PGC_SIGHUP, WAL_SETTINGS,
			gettext_noop("Forces synchronization of updates to disk."),
			gettext_noop("The server will use the fsync() system call in several places to make "
						 "sure that updates are physically written to disk. This insures "
						 "that a database cluster will recover to a consistent state after "
						 "an operating system or hardware crash.")
		},
		&enableFsync,
		true,
		NULL, NULL, NULL
	},
	{
		{"ignore_checksum_failure", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Continues processing after a checksum failure."),
			gettext_noop("Detection of a checksum failure normally causes PostgreSQL to "
						 "report an error, aborting the current transaction. Setting "
						 "ignore_checksum_failure to true causes the system to ignore the failure "
						 "(but still report a warning), and continue processing. This "
						 "behavior could cause crashes or other serious problems. Only "
						 "has an effect if checksums are enabled."),
			GUC_NOT_IN_SAMPLE
		},
		&ignore_checksum_failure,
		false,
		NULL, NULL, NULL
	},
	{
		{"zero_damaged_pages", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Continues processing past damaged page headers."),
			gettext_noop("Detection of a damaged page header normally causes PostgreSQL to "
						 "report an error, aborting the current transaction. Setting "
						 "zero_damaged_pages to true causes the system to instead report a "
						 "warning, zero out the damaged page, and continue processing. This "
						 "behavior will destroy data, namely all the rows on the damaged page."),
			GUC_NOT_IN_SAMPLE
		},
		&zero_damaged_pages,
		false,
		NULL, NULL, NULL
	},
	{
		{"ignore_invalid_pages", PGC_POSTMASTER, DEVELOPER_OPTIONS,
			gettext_noop("Continues recovery after an invalid pages failure."),
			gettext_noop("Detection of WAL records having references to "
						 "invalid pages during recovery causes PostgreSQL to "
						 "raise a PANIC-level error, aborting the recovery. "
						 "Setting ignore_invalid_pages to true causes "
						 "the system to ignore invalid page references "
						 "in WAL records (but still report a warning), "
						 "and continue recovery. This behavior may cause "
						 "crashes, data loss, propagate or hide corruption, "
						 "or other serious problems. Only has an effect "
						 "during recovery or in standby mode."),
			GUC_NOT_IN_SAMPLE
		},
		&ignore_invalid_pages,
		false,
		NULL, NULL, NULL
	},
	{
		{"full_page_writes", PGC_SIGHUP, WAL_SETTINGS,
			gettext_noop("Writes full pages to WAL when first modified after a checkpoint."),
			gettext_noop("A page write in process during an operating system crash might be "
						 "only partially written to disk.  During recovery, the row changes "
						 "stored in WAL are not enough to recover.  This option writes "
						 "pages when first modified after a checkpoint to WAL so full recovery "
						 "is possible.")
		},
		&fullPageWrites,
		true,
		NULL, NULL, NULL
	},

	{
		{"wal_log_hints", PGC_POSTMASTER, WAL_SETTINGS,
			gettext_noop("Writes full pages to WAL when first modified after a checkpoint, even for a non-critical modifications."),
			NULL
		},
		&wal_log_hints,
		false,
		NULL, NULL, NULL
	},

	{
		{"wal_compression", PGC_SUSET, WAL_SETTINGS,
			gettext_noop("Compresses full-page writes written in WAL file."),
			NULL
		},
		&wal_compression,
		false,
		NULL, NULL, NULL
	},

	{
		{"log_checkpoints", PGC_SIGHUP, LOGGING_WHAT,
			gettext_noop("Logs each checkpoint."),
			NULL
		},
		&log_checkpoints,
#ifdef _PG_REGRESS_
        true,
#else
        false,
#endif
		NULL, NULL, NULL
	},
	{
		{"log_connections", PGC_SU_BACKEND, LOGGING_WHAT,
			gettext_noop("Logs each successful connection."),
			NULL
		},
		&Log_connections,
		false,
		NULL, NULL, NULL
	},
	{
		{"log_disconnections", PGC_SU_BACKEND, LOGGING_WHAT,
			gettext_noop("Logs end of a session, including duration."),
			NULL
		},
		&Log_disconnections,
		false,
		NULL, NULL, NULL
	},
	{
		{"log_replication_commands", PGC_SUSET, LOGGING_WHAT,
			gettext_noop("Logs each replication command."),
			NULL
		},
		&log_replication_commands,
		false,
		NULL, NULL, NULL
	},
	{
		{"debug_assertions", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows whether the running server has assertion checks enabled."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&assert_enabled,
#ifdef USE_ASSERT_CHECKING
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},

	{
		{"exit_on_error", PGC_USERSET, ERROR_HANDLING_OPTIONS,
			gettext_noop("Terminate session on any error."),
			NULL
		},
		&ExitOnAnyError,
		false,
		NULL, NULL, NULL
	},
	{
		{"restart_after_crash", PGC_SIGHUP, ERROR_HANDLING_OPTIONS,
			gettext_noop("Reinitialize server after backend crash."),
			NULL
		},
		&restart_after_crash,
		true,
		NULL, NULL, NULL
	},

	{
		{"log_duration", PGC_SUSET, LOGGING_WHAT,
			gettext_noop("Logs the duration of each completed SQL statement."),
			NULL
		},
		&log_duration,
		false,
		NULL, NULL, NULL
	},
	{
		{"debug_print_parse", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("Logs each query's parse tree."),
			NULL
		},
		&Debug_print_parse,
		false,
		NULL, NULL, NULL
	},
	{
		{"debug_print_rewritten", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("Logs each query's rewritten parse tree."),
			NULL
		},
		&Debug_print_rewritten,
		false,
		NULL, NULL, NULL
	},
	{
		{"debug_print_plan", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("Logs each query's execution plan."),
			NULL
		},
		&Debug_print_plan,
		false,
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"debug_print_plan_on_error", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("Logs query's execution plan if got error."),
			NULL
		},
		&Debug_print_plan_on_error,
		false,
		NULL, NULL, NULL
	},
	{
		{"debug_print_spm", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("Log spm."),
			NULL
		},
		&debug_print_spm,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_spm", PGC_USERSET, QUERY_TUNING,
			gettext_noop("SQL Plan Manager feature central control switch."),
			NULL
		},
		&enable_spm,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
	{
		{"enable_spm_alert", PGC_USERSET, QUERY_TUNING,
			gettext_noop("SQL Plan Manager feature alert control switch."),
			NULL
		},
		&enable_spm_alert,
#ifdef _PG_REGRESS_
		false,
#else
		true,
#endif
		NULL, NULL, NULL
	},
#endif
	{
		{"debug_pretty_print", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("Indents parse and plan tree displays."),
			NULL
		},
		&Debug_pretty_print,
		true,
		NULL, NULL, NULL
	},
	{
		{"compute_query_id", PGC_SUSET, STATS_MONITORING,
			gettext_noop("Compute query identifiers."),
			NULL
		},
		&compute_query_id,
		false,
		NULL, NULL, NULL
	},
	{
		{"log_parser_stats", PGC_SUSET, STATS_MONITORING,
			gettext_noop("Writes parser performance statistics to the server log."),
			NULL
		},
		&log_parser_stats,
		false,
		check_stage_log_stats, NULL, NULL
	},
	{
		{"log_planner_stats", PGC_SUSET, STATS_MONITORING,
			gettext_noop("Writes planner performance statistics to the server log."),
			NULL
		},
		&log_planner_stats,
		false,
		check_stage_log_stats, NULL, NULL
	},
	{
		{"log_executor_stats", PGC_SUSET, STATS_MONITORING,
			gettext_noop("Writes executor performance statistics to the server log."),
			NULL
		},
		&log_executor_stats,
		false,
		check_stage_log_stats, NULL, NULL
	},
	{
		{"log_statement_stats", PGC_SUSET, STATS_MONITORING,
			gettext_noop("Writes cumulative performance statistics to the server log."),
			NULL
		},
		&log_statement_stats,
		false,
		check_log_stats, NULL, NULL
	},
#ifdef XCP
	{
		{"log_remotesubplan_stats", PGC_SUSET, STATS_MONITORING,
			gettext_noop("Writes remote subplan performance statistics to the server log."),
			NULL
		},
		&log_remotesubplan_stats,
		false,
		NULL, NULL, NULL
	},
	{
		{"log_gtm_stats", PGC_SUSET, STATS_MONITORING,
			gettext_noop("Writes GTM performance statistics to the server log."),
			NULL
		},
		&log_gtm_stats,
		false,
		NULL, NULL, NULL
	},
#endif
#ifdef BTREE_BUILD_STATS
	{
		{"log_btree_build_stats", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Logs system resource usage statistics (memory and CPU) on various B-tree operations."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&log_btree_build_stats,
		false,
		NULL, NULL, NULL
	},
#endif

	{
		{"track_activities", PGC_SUSET, STATS_COLLECTOR,
			gettext_noop("Collects information about executing commands."),
			gettext_noop("Enables the collection of information on the currently "
						 "executing command of each session, along with "
						 "the time at which that command began execution.")
		},
		&pgstat_track_activities,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_save_datachanged_timestamp", PGC_SUSET, STATS_COLLECTOR,
			gettext_noop("Collects timestamp when the data of the table changes about executing commands."),
			gettext_noop("If true, save the timestamp when the data of the table changes.")
		},
		&enable_save_datachanged_timestamp,
		true,
		NULL, NULL, NULL
	},
	{
		{"track_counts", PGC_SUSET, STATS_COLLECTOR,
			gettext_noop("Collects statistics on database activity."),
			NULL
		},
		&pgstat_track_counts,
		true,
		NULL, NULL, NULL
	},
	{
		{"track_io_timing", PGC_SUSET, STATS_COLLECTOR,
			gettext_noop("Collects timing statistics for database I/O activity."),
			NULL
		},
		&track_io_timing,
		false,
		NULL, NULL, NULL
	},

	{
		{"update_process_title", PGC_SUSET, PROCESS_TITLE,
			gettext_noop("Updates the process title to show the active SQL command."),
			gettext_noop("Enables updating of the process title every time a new SQL command is received by the server.")
		},
		&update_process_title,
#ifdef WIN32
		false,
#else
		true,
#endif
		NULL, NULL, NULL
	},

	{
		{"autovacuum", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Starts the autovacuum subprocess."),
			NULL
		},
		&autovacuum_start_daemon,
		true,
		NULL, NULL, NULL
	},
	{
		{"trace_notify", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Generates debugging output for LISTEN and NOTIFY."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_notify,
		false,
		NULL, NULL, NULL
	},

#ifdef LOCK_DEBUG
	{
		{"trace_locks", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Emits information about lock usage."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_locks,
		false,
		NULL, NULL, NULL
	},
	{
		{"trace_userlocks", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Emits information about user lock usage."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_userlocks,
		false,
		NULL, NULL, NULL
	},
	{
		{"debug_deadlocks", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Dumps information about all current locks when a deadlock timeout occurs."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Debug_deadlocks,
		false,
		NULL, NULL, NULL
	},
#endif
#if defined(LOCK_DEBUG) || defined(__OPENTENBASE_C__)
	{
		{"trace_lwlocks", PGC_SUSET, DEVELOPER_OPTIONS,
		 gettext_noop("Emits information about lightweight lock usage."),
		 NULL,
		 GUC_NOT_IN_SAMPLE
		},
		&Trace_lwlocks,
		false,
		NULL, NULL, NULL
	},
#endif
	{
		{"log_lock_waits", PGC_SUSET, LOGGING_WHAT,
			gettext_noop("Logs long lock waits."),
			NULL
		},
		&log_lock_waits,
		false,
		NULL, NULL, NULL
	},

	{
		{"log_hostname", PGC_SIGHUP, LOGGING_WHAT,
			gettext_noop("Logs the host name in the connection logs."),
			gettext_noop("By default, connection logs only show the IP address "
						 "of the connecting host. If you want them to show the host name you "
						 "can turn this on, but depending on your host name resolution "
						 "setup it might impose a non-negligible performance penalty.")
		},
		&log_hostname,
		false,
		NULL, NULL, NULL
	},
	{
		{"transform_null_equals", PGC_USERSET, COMPAT_OPTIONS_CLIENT,
			gettext_noop("Treats \"expr=NULL\" as \"expr IS NULL\"."),
			gettext_noop("When turned on, expressions of the form expr = NULL "
						 "(or NULL = expr) are treated as expr IS NULL, that is, they "
						 "return true if expr evaluates to the null value, and false "
						 "otherwise. The correct behavior of expr = NULL is to always "
						 "return null (unknown).")
		},
		&Transform_null_equals,
		false,
		NULL, NULL, NULL
	},
	{
		{"db_user_namespace", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Enables per-database user names."),
			NULL
		},
		&Db_user_namespace,
		false,
		NULL, NULL, NULL
	},
	{
		{"default_transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the default read-only status of new transactions."),
			NULL
		},
		&DefaultXactReadOnly,
		false,
		check_default_transaction_read_only, NULL, NULL
	},
	{
		{"transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the current transaction's read-only status."),
			NULL,
			GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&XactReadOnly,
		false,
		check_transaction_read_only, NULL, NULL
	},
	{
		{"default_transaction_deferrable", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the default deferrable status of new transactions."),
			NULL
		},
		&DefaultXactDeferrable,
		false,
		NULL, NULL, NULL
	},
	{
		{"transaction_deferrable", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Whether to defer a read-only serializable transaction until it can be executed with no possible serialization failures."),
			NULL,
			GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&XactDeferrable,
		false,
		check_transaction_deferrable, NULL, NULL
	},
	{
		{"row_security", PGC_USERSET, CONN_AUTH_SECURITY,
			gettext_noop("Enable row security."),
			gettext_noop("When enabled, row security will be applied to all users.")
		},
		&row_security,
		true,
		NULL, NULL, NULL
	},
	{
		{"check_function_bodies", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Check function bodies during CREATE FUNCTION."),
			NULL
		},
		&check_function_bodies,
		true,
		NULL, NULL, NULL
	},
	{
		{"check_function_pludt", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Check PLUDT for function references during CREATE FUNCTION."),
			NULL
		},
		&check_function_pludt,
		true,
		NULL, NULL, NULL
	},
	{
		{"array_nulls", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Enable input of NULL elements in arrays."),
			gettext_noop("When turned on, unquoted NULL in an array input "
						 "value means a null value; "
						 "otherwise it is taken literally.")
		},
		&Array_nulls,
		true,
		NULL, NULL, NULL
	},
	{
		{"default_with_oids", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Create new tables with OIDs by default."),
			NULL
		},
		&default_with_oids,
		false,
		NULL, NULL, NULL
	},
#ifdef _PG_ORCL_
	{
		{"plpgsql_hold_cursor", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Enable holdable cursor in plpgsql."),
			NULL
		},
		&plpgsql_hold_cursor,
		true,
		NULL, NULL, NULL
	},
	{
		{"select_into_empty", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Compatible with opentenbase_ora when select into empty."),
			NULL
		},
		&select_into_empty,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_secfunc_xact", PGC_SUSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Enable xact control in security procedure or function."),
			NULL
		},
		&enable_secfunc_xact,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_function_overload", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Enable overload for function."),
			NULL
		},
		&enable_function_overload,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_inline_target_function", PGC_SUSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Enable inline function in targetList."),
			NULL
		},
		&enable_inline_target_function,
		false,
		NULL, NULL, NULL
	},
	{
		{"function_xact_control", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("If support transaction commit/rollback in function"),
			NULL
		},
		&function_xact_control,
		true,
		NULL, NULL, NULL
	},
#endif
	{
		{"logging_collector", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Start a subprocess to capture stderr output and/or csvlogs into log files."),
			NULL
		},
		&Logging_collector,
		false,
		NULL, NULL, NULL
	},
	{
		{"log_truncate_on_rotation", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Truncate existing log files of same name during log rotation."),
			NULL
		},
		&Log_truncate_on_rotation,
		false,
		NULL, NULL, NULL
	},
#ifdef __AUDIT__
	{
		{"alog_truncate_on_rotation", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Truncate existing log files of same name during log rotation."),
			NULL
		},
		&AuditLog_truncate_on_rotation,
		false,
		NULL, NULL, NULL
	},
#endif

#ifdef TRACE_SORT
	{
		{"trace_sort", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Emit information about resource usage in sorting."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&trace_sort,
		false,
		NULL, NULL, NULL
	},
#endif

#ifdef TRACE_SYNCSCAN
	/* this is undocumented because not exposed in a standard build */
	{
		{"trace_syncscan", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Generate debugging output for synchronized scanning."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&trace_syncscan,
		false,
		NULL, NULL, NULL
	},
#endif

#ifdef DEBUG_BOUNDED_SORT
	/* this is undocumented because not exposed in a standard build */
	{
		{
			"optimize_bounded_sort", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enable bounded sorting using heap sort."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_EXPLAIN
		},
		&optimize_bounded_sort,
		true,
		NULL, NULL, NULL
	},
#endif

#ifdef WAL_DEBUG
	{
		{"wal_debug", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Emit WAL-related debugging output."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&XLOG_DEBUG,
		false,
		NULL, NULL, NULL
	},
#endif

	{
		{"integer_datetimes", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Datetimes are integer based."),
			NULL,
			GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&integer_datetimes,
		true,
		NULL, NULL, NULL
	},

	{
		{"krb_caseins_users", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive."),
			NULL
		},
		&pg_krb_caseins_users,
		false,
		NULL, NULL, NULL
	},

	{
		{"escape_string_warning", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Warn about backslash escapes in ordinary string literals."),
			NULL
		},
		&escape_string_warning,
		true,
		NULL, NULL, NULL
	},

	{
		{"standard_conforming_strings", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Causes '...' strings to treat backslashes literally."),
			NULL,
			GUC_REPORT
		},
		&standard_conforming_strings,
		true,
		NULL, NULL, NULL
	},

	{
		{"synchronize_seqscans", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Enable synchronized sequential scans."),
			NULL
		},
		&synchronize_seqscans,
		true,
		NULL, NULL, NULL
	},

	{
		{"hot_standby", PGC_POSTMASTER, REPLICATION_STANDBY,
			gettext_noop("Allows connections and queries during recovery."),
			NULL
		},
		&EnableHotStandby,
		true,
		NULL, NULL, NULL
	},

	{
		{"hot_standby_feedback", PGC_SIGHUP, REPLICATION_STANDBY,
			gettext_noop("Allows feedback from a hot standby to the primary that will avoid query conflicts."),
			NULL
		},
		&hot_standby_feedback,
		false,
		NULL, NULL, NULL
	},

	{
		{"allow_system_table_mods", PGC_POSTMASTER, DEVELOPER_OPTIONS,
			gettext_noop("Allows modifications of the structure of system tables."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&allowSystemTableMods,
		false,
		NULL, NULL, NULL
	},

	{
		{"ignore_system_indexes", PGC_BACKEND, DEVELOPER_OPTIONS,
			gettext_noop("Disables reading from system indexes."),
			gettext_noop("It does not prevent updating the indexes, so it is safe "
						 "to use.  The worst consequence is slowness."),
			GUC_NOT_IN_SAMPLE
		},
		&IgnoreSystemIndexes,
		false,
		NULL, NULL, NULL
	},
#ifdef PGXC
	{
		{"xc_maintenance_mode", PGC_SUSET, XC_HOUSEKEEPING_OPTIONS,
		    gettext_noop("Turn on XC maintenance mode."),
		 	gettext_noop("Can set ON by SET command by superuser.")
		},
		&xc_maintenance_mode,
		false,
		check_pgxc_maintenance_mode, NULL, NULL
	},
#endif

	{
		{"lo_compat_privileges", PGC_SUSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Enables backward compatibility mode for privilege checks on large objects."),
			gettext_noop("Skips privilege checks when reading or modifying large objects, "
						 "for compatibility with PostgreSQL releases prior to 9.0.")
		},
		&lo_compat_privileges,
		false,
		NULL, NULL, NULL
	},

	{
		{"operator_precedence_warning", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Emit a warning for constructs that changed meaning since PostgreSQL 9.4."),
			NULL,
		},
		&operator_precedence_warning,
		false,
		NULL, NULL, NULL
	},

	{
		{"quote_all_identifiers", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("When generating SQL fragments, quote all identifiers."),
			NULL,
		},
		&quote_all_identifiers,
		false,
		NULL, NULL, NULL
	},

	{
		{"data_checksums", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows whether data checksums are turned on for this cluster."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&data_checksums,
		false,
		NULL, NULL, NULL
	},

	{
		{"syslog_sequence_numbers", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Add sequence number to syslog messages to avoid duplicate suppression."),
			NULL
		},
		&syslog_sequence_numbers,
		true,
		NULL, NULL, NULL
	},

	{
		{"syslog_split_messages", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Split messages sent to syslog by lines and to fit into 1024 bytes."),
			NULL
		},
		&syslog_split_messages,
		true,
		NULL, NULL, NULL
	},

	{
		{"parallel_leader_participation", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("Controls whether Gather and Gather Merge also run subplans."),
			gettext_noop("Should gather nodes also run subplans, or just gather tuples?")
		},
		&obsolete_bool_guc,
		false,
		check_unused_bool_guc_set, NULL, NULL
	},

	{
		{"jit", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Allow JIT compilation."),
			NULL,
			GUC_EXPLAIN
		},
		&jit_enabled,
		false,
		NULL, NULL, NULL
	},
	
	{
		{"jit_debugging_support", PGC_SU_BACKEND, DEVELOPER_OPTIONS,
			gettext_noop("Register JIT compiled function with debugger."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&jit_debugging_support,
		false,
	
		/*
		 * This is not guaranteed to be available, but given it's a developer
		 * oriented option, it doesn't seem worth adding code checking
		 * availability.
		 */
		NULL, NULL, NULL
	},
	
	{
		{"jit_dump_bitcode", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Write out LLVM bitcode to facilitate JIT debugging."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&jit_dump_bitcode,
		false,
		NULL, NULL, NULL
	},
	
	{
		{"jit_expressions", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Allow JIT compilation of expressions."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&jit_expressions,
		true,
		NULL, NULL, NULL
	},
	
	{
		{"jit_profiling_support", PGC_SU_BACKEND, DEVELOPER_OPTIONS,
			gettext_noop("Register JIT compiled function with perf profiler."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&jit_profiling_support,
		false,
	
		/*
		 * This is not guaranteed to be available, but given it's a developer
		 * oriented option, it doesn't seem worth adding code checking
		 * availability.
		 */
		NULL, NULL, NULL
	},
	
	{
		{"jit_tuple_deforming", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Allow JIT compilation of tuple deforming."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&jit_tuple_deforming,
		true,
		NULL, NULL, NULL
	},

#ifdef __OPENTENBASE__
	{
		{"enable_filter_statistic", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("allow optimizer to extract from filters ."),
			NULL
		},
		&enable_filter_statistics,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},

	{
		{"enable_pullup_subquery", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("pullup subquery to make execution more efficient."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_pullup_subquery,
		true,
		NULL, NULL, NULL
	},

	{
		{"transform_insert_to_copy", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("try to transform insert into multi-values to copy from."),
			NULL
		},
		&g_transform_insert_to_copy,
#ifdef _PG_REGRESS_
		false,
#else
		true,
#endif
		NULL, NULL, NULL
	},

	{
		{
			"enable_pgbouncer", PGC_SIGHUP, STATS_COLLECTOR,
			gettext_noop("use pgbouncer as coordinator connection pool."),
			NULL
		},
		&g_enable_bouncer,
		false,
		NULL, NULL, NULL
	},

	{
		{
			"enable_gtm_proxy", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Enable gtm proxy a child process of Postmaster."),
			NULL
		},
		&g_enable_gtm_proxy,
		false,
		NULL, NULL, NULL
	},

	{
		{"vacuum_debug_print", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("vacuum debug print."),
			NULL
		},
		&vacuum_debug_print,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_multi_cluster", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Enable multiple clusters."),
			NULL
		},
		&enable_multi_plane,
		true,
		NULL, NULL, NULL
	},

	{
		{"enable_multi_cluster_print", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable multiple cluster print."),
			NULL
		},
		&enable_multi_plane_print,
		false,
		NULL, NULL, NULL
	},

#endif

#ifdef __OPENTENBASE_C__
	
	{
		{"serveroutput", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("print the output from opentenbase_ora DBMS_OUTPUT package."),
			NULL,
			GUC_EXPLAIN
		},
		&serveroutput,
		true,
		NULL, assign_serveroutput, NULL
	},
	{
		{"window_optimizer", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("push down window functions as possible."),
			NULL,
			GUC_EXPLAIN
		},
		&window_optimizer,
		true,
		NULL, NULL, NULL
	},

	{
		{"group_optimizer", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("optimize rollup/cube/grouping sets."),
			NULL,
			GUC_EXPLAIN
		},
		&group_optimizer,
		true,
		NULL, NULL, NULL
	},

	{
		{"nonunion_optimizer", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("optimize intersect/except, push down as possible."),
			NULL,
			GUC_EXPLAIN
		},
		&nonunion_optimizer,
		true,
		NULL, NULL, NULL
	},

	{
		{"distinct_optimizer", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("optimize distinct, push down as possible."),
			NULL,
			GUC_EXPLAIN
		},
		&distinct_optimizer,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},

	{
		{"distinct_with_hash", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("optimize agg distinct by hash as possible."),
			NULL,
			GUC_EXPLAIN
		},
		&distinct_with_hash,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},

	{
		{"enable_subquery_shipping", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("support fast query shipping for subquery"),
			NULL,
			GUC_EXPLAIN
		},
		&enable_subquery_shipping,
		true,
		NULL, NULL, NULL
	},
#endif

    {
		{"snapshot_for_analyze", PGC_USERSET, CUSTOM_OPTIONS,
		 gettext_noop("enable/disable get snapshot for analyze and rewrite"),
		 NULL
		},
		&g_snapshot_for_analyze,
		true,
		NULL, NULL, NULL
    },

    {
        {"enable_2pc_optimization", PGC_USERSET, CUSTOM_OPTIONS,
         gettext_noop("enable/disable 2pc optimization"),
         NULL
        },
        &enable_2pc_optimization,
        false,
        NULL, NULL, NULL
    },
    {
        {"enable_skip_send_read_commited", PGC_USERSET, CUSTOM_OPTIONS,
         gettext_noop("enable skip send set read commited to remote node, can"
                      "only be used when the default isolation is read commited"),
         NULL
        },
        &enable_skip_send_read_commited,
        true,
        NULL, NULL, NULL
    },
    {
		{"debug_message_log", PGC_USERSET, CUSTOM_OPTIONS,
		 gettext_noop("switch for debug message logs"),
		 NULL
		},
		&debug_message_log,
		false,
		NULL, NULL, NULL
    },
#ifdef _SHARDING_
	{
		{"allow_dml_on_datanode", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("allow insert/update/delete directly on datanode"),
			NULL
		},
		&g_allow_dml_on_datanode,
		false,
		NULL, NULL, NULL
	},
	{
		{"trace_extent", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Emits information about extent changing."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&trace_extent,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_shard_statistic", PGC_SIGHUP, STATS_COLLECTOR,
			gettext_noop("collect statistic information for shard."),
			NULL
		},
		&g_StatShardInfo,
		true,
		NULL, NULL, NULL
	},
	{
		{"show_all_shard_stat", PGC_SUSET, STATS_COLLECTOR,
			gettext_noop("show statistic information for all shards."),
			NULL
		},
		&show_all_shard_stat,
		false,
		NULL, NULL, NULL
	},
#endif

#ifdef __AUDIT_FGA__
    {
		{"enable_fga", PGC_SIGHUP, CUSTOM_OPTIONS,
			gettext_noop("Enable Fine-grained audit."),
			NULL
		},
		&enable_fga,
#ifdef _PG_REGRESS_
        true,
#else
        false,
#endif
		NULL, NULL, NULL
	},
#endif

#ifdef __OPENTENBASE__
	{
		{"enable_pgxcnode_message", PGC_USERSET, DEVELOPER_OPTIONS,
		 gettext_noop("enable CN, DN communication message print"),
		 NULL
		},
		&enable_pgxcnode_message,
		false,
		NULL, NULL, NULL
	},
	{
		{"record_history_messages", PGC_USERSET, DEVELOPER_OPTIONS,
		 gettext_noop("record the history messages processed by handle"),
		 NULL
		},
		&record_history_messages,
		true,
		NULL, NULL, NULL
	},
	{
		{"delay_sending_begin", PGC_USERSET, DEVELOPER_OPTIONS,
		 gettext_noop("the BEGIN command will not be sent with next query"),
		 NULL
		},
		&delay_sending_begin,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_pooler_debug_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable pooler manager debug infomation print"),
			NULL
		},
		&PoolConnectDebugPrint,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
    },
	{
		{"enable_pooler_stateless_reuse", PGC_POSTMASTER, CUSTOM_OPTIONS,
			 gettext_noop("enable pooler stateless reuse"),
			 NULL
		},
		&PoolerStatelessReuse,
		true,
		NULL, NULL, NULL
	},
    {
        {"enable_pooler_thread_log_print", PGC_USERSET, CUSTOM_OPTIONS,
			 gettext_noop("enable pooler manager sub thread log print"),
			 NULL
        },
        &PoolSubThreadLogPrint,
        true,
        NULL, NULL, NULL
    },
	{
		{"enable_pooler_size_check", PGC_USERSET, CUSTOM_OPTIONS,
		 	gettext_noop("enable Connection pool size check"),
		 	NULL
		},
		&PoolSizeCheck,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
	{
		{"enable_plpgsql_debug_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable plpgsql debug infomation print"),
			NULL
		},
		&PlpgsqlDebugPrint,
		false,
		NULL, NULL, NULL
	},

	{
        {"enable_gtm_debug_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable gtm debug infomation print"),
			NULL
		},
		&GTMDebugPrint,
		false,
		NULL, NULL, NULL
    },
     {
        {"skip_gtm_catalog", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("used to skip gtm catalog, WARNING:only for emergency purpose and only avaliable on coordinators."),
			NULL
		},
		&g_GTM_skip_catalog,
		false,
		NULL, NULL, NULL
    },
	{
        {"enable_distri_debug_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable distributed transaction debug print"),
			NULL
		},
		&enable_distri_print,
		false,
		NULL, NULL, NULL
    },
	{
		{"allow_limit_ident",PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
		gettext_noop("Treat 'limit' as Ident like opentenbase_ora."),
		NULL
		},
		&allow_limit_ident,
		false,
		NULL,NULL,NULL
	},
	{
		{"do_as_alias",PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("If database allow DO as column or table alias."),
			NULL
		},
		&do_as_alias,
		false,
		NULL,NULL,NULL
	},
	{
		{"case_as_alias",PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("If database allow CASE as column or table alias."),
			NULL
		},
		&case_as_alias,
		false,
		NULL,NULL,NULL
	},
	{
		  {"keywords_as_ident",PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
		   gettext_noop("If database allowed, some keywords can be indent in specific scenarios."),
		   NULL
		  },
		  &keywords_as_ident,
		  true,
		  NULL,NULL,NULL
	},
	{
		{"skip_check_same_relname",PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
		gettext_noop("Check if table alias conflicts."),
		NULL
		},
		&skip_check_same_relname,
		true,
		NULL,NULL,NULL
	},

	{
        {"enable_gts_check", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable global timestamp checking"),
			NULL
		},
		&enable_gts_check,
		false,
		NULL, NULL, NULL
    },

	{
		{"enable_threadsafety_check", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("Enable multi-threaded access monitoring to identify and analyze any unexpected issues with internal process-level resources that may arise due to concurrent thread access.If such issues indeed exist, log and other location information will be outputted to a CSV log file for further analysis."),
			NULL
		},
		&enable_threadsafety_check,
		false,
		NULL, NULL, NULL
	},

	{
        {"enable_distri_visibility_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable distributed transaction visibility print"),
			NULL
		},
		&enable_distri_visibility_print,
		false,
		NULL, NULL, NULL
    },
		
	{
		{"enable_distri_debug", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable distributed transaction debug"),
			NULL
		},
		&enable_distri_debug,
		false,
		NULL, NULL, NULL
	},

	{
		{"record_text_plantree", PGC_USERSET, CUSTOM_OPTIONS,
		 gettext_noop("Record text plantree during the execution of a query"),
		 NULL
		},
		&record_text_plantree,
		false,
		NULL, NULL, NULL
	},

	{
        {"allow_distri_query_on_standby_node", PGC_POSTMASTER, CUSTOM_OPTIONS,
         gettext_noop("allow distributed query on main plane standby node"),
         NULL
        },
        &g_allow_distri_query_on_standby_node,
        false,
        NULL, NULL, NULL
    },

	{
		{"enable_committs_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable commit ts debug print"),
			NULL
		},
		&enable_committs_print,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_exec_fragment_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable exec fragment print"),
			NULL
		},
		&enable_exec_fragment_print,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_exec_fragment_critical_print", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable exec fragment critical print"),
			NULL
		},
		&enable_exec_fragment_critical_print,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_benchmark_execution", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("tune system only for benchmark purpose with stability defects."),
			NULL
		},
		&enable_benchmark_execution,
		false,
		NULL, NULL, NULL
	},

	{
        {"enable_pooler_stuck_exit", PGC_SIGHUP, CUSTOM_OPTIONS,
			gettext_noop("enable pooler exit when pick up sync network thread failed"),
			NULL
		},
		&PoolerStuckExit,
		false,
		NULL, NULL, NULL
    },
	
	{
		{"warm_shared_buffer", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Set connection to warm shared buffer."),
			NULL,
			GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&g_WarmSharedBuffer,
		false,
		set_warm_shared_buffer, NULL, NULL
	},
	{
		{"enable_copy_silence", PGC_USERSET, PRESET_OPTIONS,
			gettext_noop("Enable copy from silent when error happens."),
			NULL
		},
		&g_enable_copy_silence,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_null_string", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("enable nulls in string."),
			NULL
		},
		&enable_null_string,
		false,
		NULL, NULL, NULL
	},
	{
		{"analyze_on_datanodes", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("do analyze on datanodes."),
			NULL,
			GUC_EXPLAIN
		},
		&analyze_on_datanodes,
		true,
		NULL, NULL, NULL
	},
#endif
#ifdef __OPENTENBASE_C__
	{
		{"enable_result_cache", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("enable result cache"),
			NULL
		},
		&enable_result_cache,
		false,
		NULL, NULL, NULL
	},
	{
		{"numeric_optimizer", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("convert numeric to int64 or int128 if possible for speedup"),
			NULL
		},
		&numeric_optimizer,
		true,
		NULL, NULL, NULL
	},
	{
		{"innerhashjoin_optimizer", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("enable fully vectorized inner hashjoin for speedup"),
			NULL
		},
		&innerhashjoin_optimizer,
		true,
		check_unused_bool_guc_set, NULL, NULL
	},
	{
		{"enable_eager_free", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("enable eager free for hash and agg and so on"),
			NULL
		},
		&enable_eager_free,
		true,
		NULL, NULL, NULL
	},
#endif

#ifdef __AUDIT__
	{
		{"enable_audit", PGC_SIGHUP, CUSTOM_OPTIONS,
			gettext_noop("Enable to audit user operations on the database objects."),
			NULL
		},
		&enable_audit,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_audit_warning", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable to print audit warning logs."),
			NULL
		},
		&enable_audit_warning,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_auditlogger_warning", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable to write audit logger process warnings."),
			NULL
		},
		&enable_auditlogger_warning,
		false,
		NULL, NULL, NULL
	},
#endif
#ifdef _MLS_
	{
		{"enable_cls", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Enable to Cube Lable Security check."),
			NULL
		},
		&g_enable_cls,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
	{
		{"enable_data_mask", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Enable to datamask feature."),
			NULL
		},
		&g_enable_data_mask,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
	{
	    {"enable_check_password", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("Enable password check."),
			gettext_noop("A valid password should contain upper case letter, lower case letter, number and special character. "
			   "The length of password should greater or equal than 8. ")
		},
		&g_CheckPassword,
		false,
		NULL, NULL, NULL
	},
#endif
#ifdef _PUB_SUB_RELIABLE_
    {
        {"enable_replication_slot_debug", PGC_USERSET, STATS,
            gettext_noop("enable_replication_slot_debug"),
            NULL
        },
        &g_replication_slot_debug,
        false,
        NULL, NULL, NULL
    },
#endif

#ifdef __TWO_PHASE_TRANS__
	{
		{"enable_2pc_file_cache", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Enable 2PC cache."),
			NULL
		},
		&enable_2pc_file_cache,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_2pc_file_check", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable 2PC file check."),
			NULL
		},
		&enable_2pc_file_check,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_2pc_entry_key_check", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable 2PC entry key check."),
			NULL
		},
		&enable_2pc_entry_key_check,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_2pc_entry_trace", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable 2PC entry trace."),
			NULL
		},
		&enable_2pc_entry_trace,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_2pc_error_stop", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable 2PC stop when commit prepared error."),
			NULL
		},
		&enable_2pc_error_stop,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_clean_2pc_launcher", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Enable clean 2PC launcher."),
			NULL
		},
		&enable_clean_2pc_launcher,
		true,
		NULL, NULL, NULL
	},
#endif
	{
			{"allow_unmatched_block_comments", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			 gettext_noop("allows the occurrence of block comments (/* */) that are not paired."),
			 NULL
			},
			&allow_unmatched_block_comments,
			false,
			NULL, NULL, NULL
	},
	{
			{"allow_type_nesting_error", PGC_USERSET, CUSTOM_OPTIONS,
			 gettext_noop("Allows nested errors in PL/SQL."),
			 NULL
			},
			&allow_type_nesting_error,
			false,
			NULL, NULL, NULL
	},
	{
		{"enable_gts_optimize", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable gts optimize."),
			NULL
		},
		&enable_gts_optimize,
		true,
		NULL, NULL, NULL
	},

	{
		{"enable_2pc_gts_optimize", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enable 2pc gts optimize."),
			NULL
		},
		&enable_2pc_gts_optimize,
		true,
		NULL, NULL, NULL
	},

#ifdef __RESOURCE_QUEUE__
	{
		{"enable_resource_queue", PGC_POSTMASTER, QUERY_TUNING_METHOD,
			gettext_noop("Enable to use resource queues to limit query's resources."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_resource_queue,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_resource_queue_debug", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enable to print details of resource queues"),
			NULL
		},
		&enable_resource_queue_debug,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_2pc_recovery_info", PGC_POSTMASTER, DEVELOPER_OPTIONS,
			 gettext_noop("write extra file for 2pc crash recovery."),
			 NULL
		},
		&enable_2pc_recovery_info,
		true,
		NULL, NULL, NULL
	},
	{
		{"tdx_ignore_error_table", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Ignore INTO error-table in external table and COPY (Deprecated)."),
			NULL
		},
		&tdx_ignore_error_table,
		false,
		NULL, NULL, NULL
	},
	{
		{"postpone_slow_node", PGC_USERSET, CUSTOM_OPTIONS,
			 gettext_noop("postpone data reception when node is not responding."),
			 NULL
		},
		&postpone_slow_node,
		true,
		NULL, NULL, NULL
	},
#endif
	{
		{"enable_resource_group", PGC_POSTMASTER, QUERY_TUNING_METHOD,
			gettext_noop("Enable to use resource group to limit query's resources."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_resource_group,
		false,
		check_enable_resource_group, assign_enable_resource_group, NULL
	},

#ifdef __OPENTENBASE__
	{
		{"enable_plpgsql_context_line_num_print", PGC_SUSET, ERROR_HANDLING_OPTIONS,
            gettext_noop("enable plpgsql context line number print."),
			NULL
		},
		&plpgsql_contenxt_line_num_print,
		true,
		NULL, NULL, NULL
	},
#endif

	/* opentenbase_ora: Enable the plpgsql format procedure qualify */
	{
			{"enable_plpgsql_format_procedure_qualified", PGC_SUSET, ERROR_HANDLING_OPTIONS,
			 gettext_noop("enable plpgsql format procedure qualified."),
			 NULL
			},
			&plpgsql_format_procedure_qualified,
			false,
			NULL, NULL, NULL
	},

#ifdef _PG_ORCL_
	{
		{"profile_resource_limit", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable profile resource limited on users."),
			NULL
		},
		&profile_resource_limit,
#ifdef _PG_REGRESS_
        true,
#else
        false,
#endif
		NULL, NULL, NULL
	},
	{
		{"profile_password_limit", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("enable profile password limited on users."),
			NULL
		},
		&profile_password_limit
		,
#ifdef _PG_REGRESS_
        true,
#else
        false,
#endif
		NULL, NULL, NULL
	},
#endif

	{
		{"unique_column_name", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Add a suffix after duplicated column except those with alias"),
			NULL
		},
		&unique_column_name,
		false,
		NULL, NULL, NULL
	},

	{
		{"resource_group_bypass", PGC_USERSET, RESOURCES,
			gettext_noop("If the value is true, the query in this session will not be limited by resource group."),
			NULL
		},
		&resource_group_bypass,
		false,
		check_resource_group_bypass, NULL, NULL
	},

	{
		{"resource_group_debug_wait_queue", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Enable the debugging check on the wait queue of resource group."),
			NULL,
			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
		},
		&resource_group_debug_wait_queue,
		true,
		NULL, NULL, NULL
	},

	{
		{"resource_group_cpu_ceiling_enforcement", PGC_POSTMASTER, RESOURCES,
			gettext_noop("If the value is true, ceiling enforcement of CPU usage will be enabled"),
			NULL
		},
		&resource_group_cpu_ceiling_enforcement,
		false, NULL, NULL
	},

		{
		{"resource_group_local", PGC_USERSET, RESOURCES,
			gettext_noop("Enable resource group on local coordinator."),
			NULL
		},
		&resource_group_local,
		false,
		NULL, NULL, NULL
	},
	{
		{"experiment_feature", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("enable experiment feature which might result in instability."),
			NULL
		},
		&experiment_feature,
#ifdef _PG_REGRESS_ 
		true,
#else 
		false,
#endif 
		NULL, NULL, NULL
	},
	{
		{"enable_experiment_isolation", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Used to control whether other isolation levels are enabled, enable experiment isolation which might result in instability."),
			NULL
		},
		&enable_experiment_isolation,
		true,
		NULL, NULL, NULL
	},
	{
		{"enable_experiment_spm", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Used to enable experimental features in SPM, such as whether temporary tables are supported for capture."),
			NULL
		},
		&enable_experiment_spm,
#ifdef _PG_REGRESS_
		true,
#else
		false,
#endif
		NULL, NULL, NULL
	},
	{
		{"inplace_upgrade", PGC_USERSET, UPGRADE_OPTIONS,
			gettext_noop("Enable/disable inplace upgrade mode."),
			NULL,
			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_NO_RESET_ALL | GUC_SUPERUSER_ONLY
		},
		&IsInplaceUpgrade,
		false, 
		check_is_upgrade,
		assign_inplace_upgrade,
		NULL
	},
	{
		{"get_system_oid", PGC_USERSET, UPGRADE_OPTIONS,
			gettext_noop("Enable/disable get oid less than FirstNormalObjectId during inplace upgrade."),
			NULL,
			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_NO_RESET_ALL | GUC_SUPERUSER_ONLY
		},
		&GetSystemOid,
		true,
		NULL,
		NULL,
		NULL
	},
	{
		{"force_ignore_redo_missing", PGC_POSTMASTER, CUSTOM_OPTIONS,
		 gettext_noop("Force ignore redo point missing, be careful set this guc to true may lead to data loss"),
		 NULL,
		 GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_NO_RESET_ALL | GUC_SUPERUSER_ONLY
		},
		&force_ignore_redo_missing,
		false, 
		NULL, NULL, NULL
	},
	
	{
		{"auto_optimize_sequence_cache", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Set whether to allow automatic cache optimization if the created sequence does not set cache value"),
			gettext_noop("When value is true, nextval will get a batch of values from GTM"
						"according to the speed of request which will reduce the pressure"
						"of GTM and cause disorder of sequence' values among nodes.")
		},
		&auto_optimize_sequence_cache,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_simple_analyze", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Set whether to allow very simple analyze, only collect pg_class.reltuples and pg_class.relpages"),
			NULL
		},
		&enable_simple_analyze,
		false,
		NULL, NULL, NULL
	},
    {
        {"enable_light_coord", PGC_USERSET, CUSTOM_OPTIONS,
         gettext_noop("enable light executor to use light cn execute mode.")
        },
        &enable_light_coord,
        true,
        NULL, NULL, NULL
    },
	{
		{"skip_mls_etc", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("Skip mls checking."),
			NULL
		},
		&skip_mls_etc,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_hybrid_sort", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Set whether to allow hybrid sort"),
			NULL	   
		},
		&enable_hybrid_sort,
		false,
		NULL, NULL, NULL
	},
	{
		{"force_transfer_datarow", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("transfer tuple between nodes in datarow form.")
		},
		&force_transfer_datarow,
		false,
		NULL, NULL, NULL
	},

	{
		{"data_sync_retry", PGC_POSTMASTER, ERROR_HANDLING_OPTIONS,
			gettext_noop("Whether to continue running after a failure to sync data files."),
		},
		&data_sync_retry,
		false,
		NULL, NULL, NULL
	},

	{
		{"fn_recv_disk_cache", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("enable disk storage cache when tqueueThread queue is full"),
			NULL
		},
		&fn_recv_disk_cache,
		true,
		NULL, NULL, NULL
	},

    {
        {"enable_lightweight_ora_syntax", PGC_USERSET, COMPAT_OPTIONS,
            gettext_noop("Enable LIGHTWEIGHT_ORA syntax in postgresql mode."),
        },
        &enable_lightweight_ora_syntax,
        false,
        NULL, NULL, NULL
    },
	{
		{"enable_partition_iterator", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enables the planner's use of partition iterator plans for partitioned table."),
			NULL
		},
		&enable_partition_iterator,
		true,
		NULL, NULL, NULL
	},

	{
			{"enable_create_package_rec_typ", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			 gettext_noop("Enable to create package record type in pg_type."),
			 NULL
			},
			&enable_create_package_rec_typ,
			false,
			NULL, NULL, NULL
	},
	{
		{"only_rename_typobj_metainfo", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			 gettext_noop("alter type rename only rename name in type object metadata table"),
			 NULL
		},
		&only_rename_typobj_metainfo,
		false,
		NULL, NULL, NULL
	},
	{
		{"different_func_argret", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			 gettext_noop("Enable function return type can different with OUT params"),
			 NULL
		},
		&different_func_argret,
		false,
		NULL, NULL, NULL
	},
	{
		  {"enable_lateral_pull_up", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
		   gettext_noop("Enable function return type can different with OUT params"),
		   NULL
		  },
		  &enable_lateral_pull_up,
		  true,
		  NULL, NULL, NULL
	},

	{
		{"enable_opentenbase_ora_column_name", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Enable to return column name like opentenbase_ora."),
			NULL
		},
		&enable_opentenbase_ora_column_name,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_opentenbase_ora_implicit_coercion", PGC_USERSET, OPENTENBASE_ORA_SHARED_IN_PG_OPTIONS,
			gettext_noop("Enable use opentenbase_ora implicit coercion."),
			NULL
		},
		&enable_opentenbase_ora_implicit_coercion,
		true,
		NULL, NULL, NULL
	},

	{
		{"enable_type_priority_in_ora_mode", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Enable use type priority in select function candidate."),
			NULL
		},
		&enable_type_priority_in_ora_mode,
		true,
		NULL, NULL, NULL
	},
	{
		{"check_orderby_distinct", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Skip check distint and order by whether match in opentenbase_ora Mode."),
			NULL
		},
		&check_orderby_distinct,
		true,
		NULL, NULL, NULL
	},

	{
		{"allow_plsql_cross_used", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Whether allow use opentenbase_ora plsql with other PL except plpgsql."),
			NULL
		},
		&allow_plsql_cross_used,
		true,
		NULL, NULL, NULL
	},

	{
		{"enable_opentenbase_ora_dist_udaf", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			 gettext_noop("Enable defining ODCI aggregate function in distribute mode."),
			 NULL
		},
		&enable_opentenbase_ora_dist_udaf,
		false,
		NULL, NULL, NULL
	},
	{
		{"plsql_analysis_strictly", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			 gettext_noop("Do PL/SQL static code analysis strictly."),
			 NULL
		},
		&plsql_analysis_strictly,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_push_pred", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables pushdown the join clause into subquery"),
			NULL
		},
		&enable_push_pred,
		false,
		NULL, NULL, NULL
	},
	{
		{"xact_autoanalyze", PGC_USERSET, STATS,
			gettext_noop("whether to allow collecting statistics within transactions and automatically trigger analyze."),
			NULL
		},
		&xact_autoanalyze,
		false,
		NULL, NULL, NULL
	},
	{
		{"disable_empty_to_null", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Disable opentenbase_ora empty string to null."),
			NULL
		},
		&disable_empty_to_null,
		false,
		NULL, NULL, NULL
	},
	{
		{"enable_pullup_expr_agg_update", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables pulling up expression subquery with aggregation in update."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_pullup_expr_agg_update,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_pullup_expr_agg_update_noqual", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables pulling up non-correlation expression subquery with aggregation in update."),
			NULL,
			GUC_EXPLAIN
		},
		&enable_pullup_expr_agg_update_noqual,
		false,
		NULL, NULL, NULL
	},

	{
		{"enable_auto_kill_old_trans", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Enable automatic killing of excessively old transactions "
					"(processes with XIDs that are beyond maximum value between autovacuum_freeze_max_age and 2 billion from the current XID)."),
			NULL
		},
		&enable_auto_kill_old_trans,
		true,
		NULL, NULL, NULL
	},

	{
		{"convert_sysview_to_sysclass", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Get system class instead of system view in regclass function with opentenbase_ora mode."),
			NULL
		},
		&convert_sysview_to_sysclass,
		true,
		NULL, NULL, NULL
	},
	
	{
		{"page_checksums", PGC_POSTMASTER, PRESET_OPTIONS,
			 gettext_noop("Shows whether data checksums are turned on for this cluster."),
			 NULL,
			 GUC_NOT_IN_SAMPLE
		},
		&page_checksums,
		true,
		check_page_checksums, NULL, NULL
	},

	{
		{"checksum_ddl_default", PGC_POSTMASTER, PRESET_OPTIONS,
			 gettext_noop("Shows whether new objects are created with the checksum option by default."),
			 NULL,
			 GUC_NOT_IN_SAMPLE
		},
		&checksum_ddl_default,
		true,
		NULL, NULL, NULL
	},


	{
		{"intransaction_purne", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Enables the purning invisible tuples in transaction."),
			NULL
		},
		&intransaction_purne,
		 true,
		NULL, NULL, NULL
	},

	{
		{"read_only_with_local_ts", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the read-only with local ts status of new transactions."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE | GUC_SUPERUSER_ONLY
		},
		&ReadWithLocalTs,
		false,
		NULL, NULL, NULL
	},

	/* End-of-list marker */
	{
		{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL
	}
};


static struct config_int ConfigureNamesInt[] =
{
	{
		{"archive_timeout", PGC_SIGHUP, WAL_ARCHIVING,
			gettext_noop("Forces a switch to the next WAL file if a "
						 "new file has not been started within N seconds."),
			NULL,
			GUC_UNIT_S
		},
		&XLogArchiveTimeout,
		0, 0, INT_MAX / 2,
		NULL, NULL, NULL
	},
	{
		{"post_auth_delay", PGC_BACKEND, DEVELOPER_OPTIONS,
			gettext_noop("Waits N seconds on connection startup after authentication."),
			gettext_noop("This allows attaching a debugger to the process."),
			GUC_NOT_IN_SAMPLE | GUC_UNIT_S
		},
		&PostAuthDelay,
		0, 0, INT_MAX / 1000000,
		NULL, NULL, NULL
	},
	{
		{"default_statistics_target", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Sets the default statistics target."),
			gettext_noop("This applies to table columns that have not had a "
						 "column-specific target set via ALTER TABLE SET STATISTICS.")
		},
		&default_statistics_target,
		100, 1, 10000,
		NULL, NULL, NULL
	},
	{
		{"from_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Sets the FROM-list size beyond which subqueries "
						 "are not collapsed."),
			gettext_noop("The planner will merge subqueries into upper "
						 "queries if the resulting FROM list would have no more than "
						 "this many items."),
			GUC_EXPLAIN
		},
		&from_collapse_limit,
		8, 1, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"join_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Sets the FROM-list size beyond which JOIN "
						 "constructs are not flattened."),
			gettext_noop("The planner will flatten explicit JOIN "
						 "constructs into lists of FROM items whenever a "
						 "list of no more than this many items would result."),
			GUC_EXPLAIN
		},
		&join_collapse_limit,
		8, 1, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"geqo_threshold", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("Sets the threshold of FROM items beyond which GEQO is used."),
			NULL,
			GUC_EXPLAIN
		},
		&geqo_threshold,
		12, 2, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"geqo_effort", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("GEQO: effort is used to set the default for other GEQO parameters."),
			NULL,
			GUC_EXPLAIN
		},
		&Geqo_effort,
		DEFAULT_GEQO_EFFORT, MIN_GEQO_EFFORT, MAX_GEQO_EFFORT,
		NULL, NULL, NULL
	},
	{
		{"geqo_pool_size", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("GEQO: number of individuals in the population."),
			gettext_noop("Zero selects a suitable default value."),
			GUC_EXPLAIN
		},
		&Geqo_pool_size,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"geqo_generations", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("GEQO: number of iterations of the algorithm."),
			gettext_noop("Zero selects a suitable default value."),
			GUC_EXPLAIN
		},
		&Geqo_generations,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		/* This is PGC_SUSET to prevent hiding from log_lock_waits. */
		{"deadlock_timeout", PGC_SUSET, LOCK_MANAGEMENT,
			gettext_noop("Sets the time to wait on a lock before checking for deadlock."),
			NULL,
			GUC_UNIT_MS
		},
		&DeadlockTimeout,
		1000, 1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"max_standby_archive_delay", PGC_SIGHUP, REPLICATION_STANDBY,
			gettext_noop("Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data."),
			NULL,
			GUC_UNIT_MS
		},
		&max_standby_archive_delay,
		30 * 1000, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"max_standby_streaming_delay", PGC_SIGHUP, REPLICATION_STANDBY,
			gettext_noop("Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data."),
			NULL,
			GUC_UNIT_MS
		},
		&max_standby_streaming_delay,
		30 * 1000, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"wal_receiver_status_interval", PGC_SIGHUP, REPLICATION_STANDBY,
			gettext_noop("Sets the maximum interval between WAL receiver status reports to the primary."),
			NULL,
			GUC_UNIT_S
		},
		&wal_receiver_status_interval,
		10, 0, INT_MAX / 1000,
		NULL, NULL, NULL
	},

	{
		{"wal_receiver_timeout", PGC_SIGHUP, REPLICATION_STANDBY,
			gettext_noop("Sets the maximum wait time to receive data from the primary."),
			NULL,
			GUC_UNIT_MS
		},
		&wal_receiver_timeout,
		60 * 1000, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"max_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the maximum number of concurrent connections."),
			NULL
		},
		&MaxConnections,
		100, 1, MAX_BACKENDS,
		check_maxconnections, NULL, NULL
	},

	{
		{"superuser_reserved_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the number of connection slots reserved for superusers."),
			NULL
		},
		&ReservedBackends,
		3, 0, MAX_BACKENDS,
		NULL, NULL, NULL
	},
	{
			{"logical_apply_time_delay", PGC_SIGHUP, REPLICATION_STANDBY,
			 gettext_noop("Process changes within N(seconds) in batches while applying ON CN."),
			 NULL,
			 GUC_UNIT_S
			},
			&logical_apply_time_delay,
			0, 0, INT_MAX,
			NULL, NULL, NULL
	},
	{
			{"logical_apply_cache_capacity", PGC_SIGHUP, REPLICATION_STANDBY,
			 gettext_noop("Process N records at least in batches while applying ON CN."),
			 NULL
			 },
			&logical_apply_cache_capacity,
			0, 0, INT_MAX, /* 5000 */
			NULL, NULL, NULL
	},

	/*
	 * We sometimes multiply the number of shared buffers by two without
	 * checking for overflow, so we mustn't allow more than INT_MAX / 2.
	 */
	{
		{"shared_buffers", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Sets the number of shared memory buffers used by the server."),
			NULL,
			GUC_UNIT_BLOCKS | GUC_EXPLAIN
		},
		&NBuffers,
		1024, 16, INT_MAX / 2,
		NULL, NULL, NULL
	},

	{
		{"fn_shared_buffers", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Sets the number of shared memory buffers used by forward node."),
			NULL,
			GUC_UNIT_BLOCKS | GUC_EXPLAIN
		},
		&FnNBuffers,
#ifdef _PG_REGRESS_
		8192,
#else
		300000,
#endif
		160, INT_MAX / 2,
		NULL, NULL, NULL
	},

	{
		{"temp_buffers", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum number of temporary buffers used by each session."),
			NULL,
			GUC_UNIT_BLOCKS | GUC_EXPLAIN
		},
		&num_temp_buffers,
		1024, 100, INT_MAX / 2,
		check_temp_buffers, NULL, NULL
	},
	{
		{"space_budget_limit", PGC_POSTMASTER, QUERY_TUNING,
			gettext_noop("Used to set the upper limit for allowing the creation of baselines in SPM (SQL Plan Management)."),
			NULL,
			GUC_EXPLAIN
		},
		&space_budget_limit,
		10000, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"space_budget_percent", PGC_USERSET, QUERY_TUNING,
			gettext_noop("Used to set the percentage threshold for the upper limit of allowing the creation of baselines in "
		                 "SPM (SQL Plan Management). When exceeded, it triggers an alert."),
			NULL,
			GUC_EXPLAIN
		},
		&space_budget_percent,
		80, -1, 100,
		NULL, NULL, NULL
	},
	{
		{"plan_retention_weeks", PGC_USERSET, QUERY_TUNING,
			gettext_noop("Used to set the percentage threshold for the upper limit of allowing the creation of baselines in "
		                 "SPM (SQL Plan Management). When exceeded, it triggers an alert."),
			NULL,
			GUC_EXPLAIN
		},
		&plan_retention_weeks,
		-1, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"port", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the TCP port the server listens on."),
			NULL
		},
		&PostPortNumber,
		DEF_PGPORT, 1, 65535,
		NULL, NULL, NULL
	},

	{
		{"unix_socket_permissions", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the access permissions of the Unix-domain socket."),
			gettext_noop("Unix-domain sockets use the usual Unix file system "
						 "permission set. The parameter value is expected "
						 "to be a numeric mode specification in the form "
						 "accepted by the chmod and umask system calls. "
						 "(To use the customary octal format the number must "
						 "start with a 0 (zero).)")
		},
		&Unix_socket_permissions,
		0777, 0000, 0777,
		NULL, NULL, show_unix_socket_permissions
	},

	{
		{"log_file_mode", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the file permissions for log files."),
			gettext_noop("The parameter value is expected "
						 "to be a numeric mode specification in the form "
						 "accepted by the chmod and umask system calls. "
						 "(To use the customary octal format the number must "
						 "start with a 0 (zero).)")
		},
		&Log_file_mode,
		0600, 0000, 0777,
		NULL, NULL, show_log_file_mode
	},
#ifdef __AUDIT__
	{
		{"alog_file_mode", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the file permissions for audit log files."),
			gettext_noop("The parameter value is expected "
						 "to be a numeric mode specification in the form "
						 "accepted by the chmod and umask system calls. "
						 "(To use the customary octal format the number must "
						 "start with a 0 (zero).)")
		},
		&AuditLog_file_mode,
		0600, 0000, 0777,
		NULL, NULL, show_alog_file_mode
	},
#endif
	{
		{"work_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum memory to be used for query workspaces."),
			gettext_noop("This much memory can be used by each internal "
						 "sort operation and hash table before switching to "
						 "temporary disk files."),
			GUC_UNIT_KB | GUC_EXPLAIN
		},
		&work_mem,
		65535, 64, MAX_KILOBYTES,
		NULL, NULL, NULL
	},

	{
		{"work_mem_limit_multiplier", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("maximum memory beyond work_mem, raise an error for protection."),
			NULL
		},
		&work_mem_limit_multiplier,
		10, 1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"maintenance_work_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum memory to be used for maintenance operations."),
			gettext_noop("This includes operations such as VACUUM and CREATE INDEX."),
			GUC_UNIT_KB
		},
		&maintenance_work_mem,
		65536, 1024, MAX_KILOBYTES,
		NULL, NULL, NULL
	},

	{
		{"query_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum memory to be used for a query."),
			NULL,
			GUC_UNIT_KB | GUC_EXPLAIN
		},
		&query_mem,
		0, 0, MAX_KILOBYTES,
		check_query_mem, assign_query_mem, NULL
	},

	{
		{"max_query_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum value for query_mem setting."),
			NULL,
			GUC_UNIT_KB | GUC_EXPLAIN
		},
		&max_query_mem,
		0, 0, MAX_KILOBYTES,
		check_max_query_mem, assign_max_query_mem, NULL
	},

	{
		{"fn_recv_work_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum memory to be used for fragment recv operations."),
			gettext_noop("This much memory can be used by each fragment to recv max rows of vts."),
			GUC_UNIT_KB
		},
		&fn_recv_work_mem,
		1048576, 1024, MAX_KILOBYTES,
		NULL, NULL, NULL
	},

	{
		{"fn_send_regiser_factor", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("The factor of the number of pages registered in sender of a fragment"),
			NULL
		},
		&fn_send_regiser_factor,
		2, 1, 1024,
		NULL, NULL, NULL
	},

	/*
	 * We use the hopefully-safely-small value of 100kB as the compiled-in
	 * default for max_stack_depth.  InitializeGUCOptions will increase it if
	 * possible, depending on the actual platform-specific stack limit.
	 */
	{
		{"max_stack_depth", PGC_SUSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum stack depth, in kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&max_stack_depth,
		100, 100, MAX_KILOBYTES,
		check_max_stack_depth, assign_max_stack_depth, NULL
	},

	{
		{"temp_file_limit", PGC_SUSET, RESOURCES_DISK,
			gettext_noop("Limits the total size of all temporary files used by each process."),
			gettext_noop("-1 means no limit."),
			GUC_UNIT_KB
		},
		&temp_file_limit,
		-1, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"vacuum_cost_page_hit", PGC_USERSET, RESOURCES_VACUUM_DELAY,
			gettext_noop("Vacuum cost for a page found in the buffer cache."),
			NULL
		},
		&VacuumCostPageHit,
		1, 0, 10000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_cost_page_miss", PGC_USERSET, RESOURCES_VACUUM_DELAY,
			gettext_noop("Vacuum cost for a page not found in the buffer cache."),
			NULL
		},
		&VacuumCostPageMiss,
		10, 0, 10000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_cost_page_dirty", PGC_USERSET, RESOURCES_VACUUM_DELAY,
			gettext_noop("Vacuum cost for a page dirtied by vacuum."),
			NULL
		},
		&VacuumCostPageDirty,
		20, 0, 10000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_cost_limit", PGC_USERSET, RESOURCES_VACUUM_DELAY,
			gettext_noop("Vacuum cost amount available before napping."),
			NULL
		},
		&VacuumCostLimit,
		200, 1, 10000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_cost_delay", PGC_USERSET, RESOURCES_VACUUM_DELAY,
			gettext_noop("Vacuum cost delay in milliseconds."),
			NULL,
			GUC_UNIT_MS
		},
		&VacuumCostDelay,
		0, 0, 100,
		NULL, NULL, NULL
	},

	{
		{"autovacuum_vacuum_cost_delay", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Vacuum cost delay in milliseconds, for autovacuum."),
			NULL,
			GUC_UNIT_MS
		},
		&autovacuum_vac_cost_delay,
		20, -1, 100,
		NULL, NULL, NULL
	},

	{
		{"autovacuum_vacuum_cost_limit", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Vacuum cost amount available before napping, for autovacuum."),
			NULL
		},
		&autovacuum_vac_cost_limit,
		-1, -1, 10000,
		NULL, NULL, NULL
	},

	{
		{"gts_maintain_option", PGC_SIGHUP, DEVELOPER_OPTIONS,
			gettext_noop("Enables check correctness of GTS and reseting it if it is wrong"),
			NULL
		},
		&gts_maintain_option,
		0, 0, 2,
		NULL, NULL, NULL
	},

	{
		{"max_files_per_process", PGC_POSTMASTER, RESOURCES_KERNEL,
			gettext_noop("Sets the maximum number of simultaneously open files for each server process."),
			NULL
		},
		&max_files_per_process,
		1000, 25, INT_MAX,
		NULL, NULL, NULL
	},
	/*
	 * See also CheckRequiredParameterValues() if this parameter changes
	 */
	{
		{"max_prepared_transactions", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Sets the maximum number of simultaneously prepared transactions."),
			NULL
		},
		&max_prepared_xacts,
#ifdef PGXC
		10000, 0, INT_MAX / 4,
		NULL, NULL, NULL
#else
		0, 0, MAX_BACKENDS,
		NULL, NULL, NULL
#endif
	},

#ifdef LOCK_DEBUG
	{
		{"trace_lock_oidmin", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Sets the minimum OID of tables for tracking locks."),
			gettext_noop("Is used to avoid output on system tables."),
			GUC_NOT_IN_SAMPLE
		},
		&Trace_lock_oidmin,
		FirstNormalObjectId, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"trace_lock_table", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Sets the OID of the table with unconditionally lock tracing."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_lock_table,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
#endif

	{
		{"statement_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the maximum allowed duration of any statement."),
			gettext_noop("A value of 0 turns off the timeout."),
			GUC_UNIT_MS
		},
		&StatementTimeout,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"gts_cache_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
			 gettext_noop("Set the local cache time of the obtained gts."),
			 gettext_noop("A value of 0 turns off the timeout."),
			 GUC_UNIT_MS
		},
		&gts_cache_timeout,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"lock_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the maximum allowed duration of any wait for a lock."),
			gettext_noop("A value of 0 turns off the timeout."),
			GUC_UNIT_MS
		},
		&LockTimeout,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"idle_in_transaction_session_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the maximum allowed duration of any idling transaction."),
			gettext_noop("A value of 0 turns off the timeout."),
			GUC_UNIT_MS
		},
		&IdleInTransactionSessionTimeout,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"idle_in_session_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
			 gettext_noop("Sets the maximum allowed idle time between queries, when not in a transaction."),
			 gettext_noop("A value of 0 turns off the timeout."),
			 GUC_UNIT_MS
		},
		&IdleSessionTimeout,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"persistent_connections_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
			 gettext_noop("Set the timeout for idle sessions to hold connections."),
		     gettext_noop("value of 0 turns off the timeout and release connections at the end of the transaction, "
					      "value of -1 turns off the timeout and always holding the connections."),
		 	 GUC_UNIT_MS
		},
		&PersistentConnectionsTimeout,
		5000, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"vacuum_freeze_min_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Minimum age at which VACUUM should freeze a table row."),
			NULL
		},
		&vacuum_freeze_min_age,
		50000000, 0, 1000000000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_defer_freeze_min_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Minimum age at which VACUUM should defer to freeze a table row to avoid failure due to "
					"too old timestamp."),
			NULL
		},
		&vacuum_defer_freeze_min_age,
		10000, 0, 1000000000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_freeze_table_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Age at which VACUUM should scan whole table to freeze tuples."),
			NULL
		},
		&vacuum_freeze_table_age,
		150000000, 0, 2000000000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_multixact_freeze_min_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Minimum age at which VACUUM should freeze a MultiXactId in a table row."),
			NULL
		},
		&vacuum_multixact_freeze_min_age,
		5000000, 0, 1000000000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_multixact_freeze_table_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Multixact age at which VACUUM should scan whole table to freeze tuples."),
			NULL
		},
		&vacuum_multixact_freeze_table_age,
		150000000, 0, 2000000000,
		NULL, NULL, NULL
	},

	{
		{"vacuum_defer_cleanup_age", PGC_SIGHUP, REPLICATION_MASTER,
			gettext_noop("Number of transactions by which VACUUM and HOT cleanup should be deferred, if any."),
			NULL
		},
		&vacuum_defer_cleanup_age,
		0, 0, 1000000,
		NULL, NULL, NULL
	},
				
	{
		{"vacuum_delta", PGC_POSTMASTER, REPLICATION_MASTER,
			gettext_noop("The time period before which VACUUM and HOT cleanup could clean the transactions, if any."),
			NULL
		},
		&vacuum_delta,
		100, 1, INT_MAX,
		NULL, NULL, NULL
	},
		
	{
		{"delay_before_acquire_committs", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Delay transaction commit before acquiring commmitts (us)."),
			NULL
		},
		&delay_before_acquire_committs,
		0, 0, 100000000,
		NULL, NULL, NULL
	},
	{
		{"delay_after_acquire_committs", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Delay transaction commit after acquiring commmitts (us)."),
			NULL
		},
		&delay_after_acquire_committs,
		0, 0, 100000000,
		NULL, NULL, NULL
	},

#ifdef __OPENTENBASE_C__
	{
		{"standby_plane_query_delay", PGC_USERSET, RESOURCES,
			gettext_noop("delay time of query in standby."),
			NULL
		},
		&query_delay,
		0, 0, 31536000,
		NULL, NULL, NULL
	},
	{
		{"error_stacktrace_level", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("debug level when got error, 0-none, 1-print stack trace, 2-core dump"),
			NULL
		},
		&error_stacktrace_level,
		1, 0, 2,
		NULL, NULL, NULL
	},
	{
		{"shard_cluster_num", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Overall number of shard clusters used in data storage."),
			gettext_noop("Do not change this setting unless you know exactly what you are doing.")
		},
		&shard_cluster_num,
		8, 1, MAX_SHARD_CLUSTER_NUM,
		NULL, NULL, NULL
	},
#endif
	/*
	 * See also CheckRequiredParameterValues() if this parameter changes
	 */
	{
		{"max_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
			gettext_noop("Sets the maximum number of locks per transaction."),
			gettext_noop("The shared lock table is sized on the assumption that "
						 "at most max_locks_per_transaction * max_connections distinct "
						 "objects will need to be locked at any one time.")
		},
		&max_locks_per_xact,
		64, 10, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"max_pred_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
			gettext_noop("Sets the maximum number of predicate locks per transaction."),
			gettext_noop("The shared predicate lock table is sized on the assumption that "
						 "at most max_pred_locks_per_transaction * max_connections distinct "
						 "objects will need to be locked at any one time.")
		},
		&max_predicate_locks_per_xact,
		64, 10, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"max_pred_locks_per_relation", PGC_SIGHUP, LOCK_MANAGEMENT,
			gettext_noop("Sets the maximum number of predicate-locked pages and tuples per relation."),
			gettext_noop("If more than this total of pages and tuples in the same relation are locked "
						 "by a connection, those locks are replaced by a relation level lock.")
		},
		&max_predicate_locks_per_relation,
		-2, INT_MIN, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"max_pred_locks_per_page", PGC_SIGHUP, LOCK_MANAGEMENT,
			gettext_noop("Sets the maximum number of predicate-locked tuples per page."),
			gettext_noop("If more than this number of tuples on the same page are locked "
						 "by a connection, those locks are replaced by a page level lock.")
		},
		&max_predicate_locks_per_page,
		2, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"authentication_timeout", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Sets the maximum allowed time to complete client authentication."),
			NULL,
			GUC_UNIT_S
		},
		&AuthenticationTimeout,
		60, 1, 600,
		NULL, NULL, NULL
	},

	{
		/* Not for general use */
		{"pre_auth_delay", PGC_SIGHUP, DEVELOPER_OPTIONS,
			gettext_noop("Waits N seconds on connection startup before authentication."),
			gettext_noop("This allows attaching a debugger to the process."),
			GUC_NOT_IN_SAMPLE | GUC_UNIT_S
		},
		&PreAuthDelay,
		0, 0, 60,
		NULL, NULL, NULL
	},

	{
		{"wal_keep_segments", PGC_SIGHUP, REPLICATION_SENDING,
			gettext_noop("Sets the number of WAL files held for standby servers."),
			NULL
		},
		&wal_keep_segments,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"min_wal_size", PGC_SIGHUP, WAL_CHECKPOINTS,
			gettext_noop("Sets the minimum size to shrink the WAL to."),
			NULL,
			GUC_UNIT_MB
		},
		&min_wal_size_mb,
		5 * (XLOG_SEG_SIZE / (1024 * 1024)), 2, MAX_KILOBYTES,
		NULL, NULL, NULL
	},

	{
		{"max_wal_size", PGC_SIGHUP, WAL_CHECKPOINTS,
			gettext_noop("Sets the WAL size that triggers a checkpoint."),
			NULL,
			GUC_UNIT_MB
		},
		&max_wal_size_mb,
		64 * (XLOG_SEG_SIZE / (1024 * 1024)), 2, MAX_KILOBYTES,
		NULL, assign_max_wal_size, NULL
	},

	{
		{"checkpoint_timeout", PGC_SIGHUP, WAL_CHECKPOINTS,
			gettext_noop("Sets the maximum time between automatic WAL checkpoints."),
			NULL,
			GUC_UNIT_S
		},
		&CheckPointTimeout,
		300, 30, 86400,
		NULL, NULL, NULL
	},

	{
		{"checkpoint_warning", PGC_SIGHUP, WAL_CHECKPOINTS,
			gettext_noop("Enables warnings if checkpoint segments are filled more "
						 "frequently than this."),
			gettext_noop("Write a message to the server log if checkpoints "
						 "caused by the filling of checkpoint segment files happens more "
						 "frequently than this number of seconds. Zero turns off the warning."),
			GUC_UNIT_S
		},
		&CheckPointWarning,
		30, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"checkpoint_flush_after", PGC_SIGHUP, WAL_CHECKPOINTS,
			gettext_noop("Number of pages after which previously performed writes are flushed to disk."),
			NULL,
			GUC_UNIT_BLOCKS
		},
		&checkpoint_flush_after,
		DEFAULT_CHECKPOINT_FLUSH_AFTER, 0, WRITEBACK_MAX_PENDING_FLUSHES,
		NULL, NULL, NULL
	},

	{
		{"wal_buffers", PGC_POSTMASTER, WAL_SETTINGS,
			gettext_noop("Sets the number of disk-page buffers in shared memory for WAL."),
			NULL,
			GUC_UNIT_XBLOCKS
		},
		&XLOGbuffers,
		-1, -1, (INT_MAX / XLOG_BLCKSZ),
		check_wal_buffers, NULL, NULL
	},

	{
		{"wal_writer_delay", PGC_SIGHUP, WAL_SETTINGS,
			gettext_noop("Time between WAL flushes performed in the WAL writer."),
			NULL,
			GUC_UNIT_MS
		},
		&WalWriterDelay,
		200, 1, 10000,
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"gts_acquire_gap", PGC_SIGHUP, WAL_SETTINGS,
			gettext_noop("Time gap between global timestamp acquirement in the WAL writer."),
			NULL,
			GUC_UNIT_S
		},
		&WalGTSAcquireDelay,
		30, 10, 1800,
		NULL, NULL, NULL
	},
#endif

	{
		{"wal_writer_flush_after", PGC_SIGHUP, WAL_SETTINGS,
			gettext_noop("Amount of WAL written out by WAL writer that triggers a flush."),
			NULL,
			GUC_UNIT_XBLOCKS
		},
		&WalWriterFlushAfter,
		(1024 * 1024) / XLOG_BLCKSZ, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		/* see max_connections */
		{"max_wal_senders", PGC_POSTMASTER, REPLICATION_SENDING,
			gettext_noop("Sets the maximum number of simultaneously running WAL sender processes."),
			NULL
		},
		&max_wal_senders,
		64, 0, MAX_BACKENDS,
		NULL, NULL, NULL
	},

	{
		/* see max_connections */
		{"max_replication_slots", PGC_POSTMASTER, REPLICATION_SENDING,
			gettext_noop("Sets the maximum number of simultaneously defined replication slots."),
			NULL
		},
		&max_replication_slots,
		64, 0, MAX_BACKENDS /* XXX? */ ,
		NULL, NULL, NULL
	},

	{
		{"wal_sender_timeout", PGC_SIGHUP, REPLICATION_SENDING,
			gettext_noop("Sets the maximum time to wait for WAL replication."),
			NULL,
			GUC_UNIT_MS
		},
		&wal_sender_timeout,
		60 * 1000, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"commit_delay", PGC_SUSET, WAL_SETTINGS,
			gettext_noop("Sets the delay in microseconds between transaction commit and "
						 "flushing WAL to disk."),
			NULL
			/* we have no microseconds designation, so can't supply units here */
		},
		&CommitDelay,
		0, 0, 100000,
		NULL, NULL, NULL
	},

	{
		{"commit_siblings", PGC_USERSET, WAL_SETTINGS,
			gettext_noop("Sets the minimum concurrent open transactions before performing "
						 "commit_delay."),
			NULL
		},
		&CommitSiblings,
		5, 0, 1000,
		NULL, NULL, NULL
	},

	{
		{"extra_float_digits", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the number of digits displayed for floating-point values."),
			gettext_noop("This affects real, double precision, and geometric data types. "
						 "A zero or negative parameter value is added to the standard "
						 "number of digits (FLT_DIG or DBL_DIG as appropriate). "
						 "Any value greater than zero selects precise output mode.")
		},
		&extra_float_digits,
		1, -15, 3,
		NULL, NULL, NULL
	},

	{
		{"log_min_duration_statement", PGC_SUSET, LOGGING_WHEN,
			gettext_noop("Sets the minimum execution time above which "
						 "statements will be logged."),
			gettext_noop("Zero prints all queries. -1 turns this feature off."),
			GUC_UNIT_MS
		},
		&log_min_duration_statement,
		-1, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"log_autovacuum_min_duration", PGC_SIGHUP, LOGGING_WHAT,
			gettext_noop("Sets the minimum execution time above which "
						 "autovacuum actions will be logged."),
			gettext_noop("Zero prints all actions. -1 turns autovacuum logging off."),
			GUC_UNIT_MS
		},
		&Log_autovacuum_min_duration,
		-1, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"bgwriter_delay", PGC_SIGHUP, RESOURCES_BGWRITER,
			gettext_noop("Background writer sleep time between rounds."),
			NULL,
			GUC_UNIT_MS
		},
		&BgWriterDelay,
		200, 10, 10000,
		NULL, NULL, NULL
	},

	{
		{"bgwriter_lru_maxpages", PGC_SIGHUP, RESOURCES_BGWRITER,
			gettext_noop("Background writer maximum number of LRU pages to flush per round."),
			NULL
		},
		&bgwriter_lru_maxpages,
		100, 0, INT_MAX / 2,	/* Same upper limit as shared_buffers */
		NULL, NULL, NULL
	},

	{
		{"pullup_target_casewhen_filter", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enables add filters when pulling up case when expression in target list."),
			NULL
		},
		&pullup_target_casewhen_filter,
		0, 0, INT_MAX / 2,
		NULL, NULL, NULL
	},

	{
		{"bgwriter_flush_after", PGC_SIGHUP, RESOURCES_BGWRITER,
			gettext_noop("Number of pages after which previously performed writes are flushed to disk."),
			NULL,
			GUC_UNIT_BLOCKS
		},
		&bgwriter_flush_after,
		DEFAULT_BGWRITER_FLUSH_AFTER, 0, WRITEBACK_MAX_PENDING_FLUSHES,
		NULL, NULL, NULL
	},

	{
		{"effective_io_concurrency",
			PGC_USERSET,
			RESOURCES_ASYNCHRONOUS,
			gettext_noop("Number of simultaneous requests that can be handled efficiently by the disk subsystem."),
			gettext_noop("For RAID arrays, this should be approximately the number of drive spindles in the array.")
		},
		&effective_io_concurrency,
#ifdef USE_PREFETCH
		1, 0, MAX_IO_CONCURRENCY,
#else
		0, 0, 0,
#endif
		check_effective_io_concurrency, assign_effective_io_concurrency, NULL
	},

	{
		{"backend_flush_after", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("Number of pages after which previously performed writes are flushed to disk."),
			NULL,
			GUC_UNIT_BLOCKS
		},
		&backend_flush_after,
		DEFAULT_BACKEND_FLUSH_AFTER, 0, WRITEBACK_MAX_PENDING_FLUSHES,
		NULL, NULL, NULL
	},

	{
		{"max_worker_processes",
			PGC_POSTMASTER,
			RESOURCES_ASYNCHRONOUS,
			gettext_noop("Maximum number of concurrent worker processes."),
			NULL,
		},
		&max_worker_processes,
		MAX_PARALLEL_WORKER_LIMIT, 0, MAX_BACKENDS,
		check_max_worker_processes, NULL, NULL
	},

	{
		{"max_logical_replication_workers",
			PGC_POSTMASTER,
			REPLICATION_SUBSCRIBERS,
			gettext_noop("Maximum number of logical replication worker processes."),
			NULL,
		},
		&max_logical_replication_workers,
		64, 0, MAX_BACKENDS,
		NULL, NULL, NULL
	},

	{
		{"max_sync_workers_per_subscription",
			PGC_SIGHUP,
			REPLICATION_SUBSCRIBERS,
			gettext_noop("Maximum number of table synchronization workers per subscription."),
			NULL,
		},
		&max_sync_workers_per_subscription,
		4, 0, MAX_BACKENDS,
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"max_network_bandwidth_per_subscription",
			PGC_SIGHUP,
			REPLICATION_SUBSCRIBERS,
			gettext_noop("Maximum network bandwidth per subscription."),
			NULL,
		},
		&max_network_bandwidth_per_subscription,
		50, 10, INT_MAX,
		NULL, NULL, NULL
	},
		
	{
		{"base_backup_limit", PGC_SIGHUP, RESOURCES_KERNEL,
				gettext_noop("basebackup speed limit."),
		},
		&g_TransferSpeed,
		50, 1, 10240,
		NULL, NULL, NULL
	},

	{
		{"enable_simple_numeric", PGC_USERSET, RESOURCES_KERNEL,
				gettext_noop("Use simple data type for numeric."),
		},
		&enable_simple_numeric,
		0, 0, 0,
		NULL, NULL, NULL
	},

	{
		{"max_sessions_per_shardpool", PGC_POSTMASTER, STATS_COLLECTOR,
			gettext_noop("max number of sessions for each shard pool."),
			gettext_noop("shard pool is used to store the statistic info about each shard from" 
			             " 0 to maxshards."),
		},
		&g_MaxSessionsPerPool,
		100, 10, 250,
		NULL, NULL, NULL
	},
	{
		{"shard_statistic_flush_interval", PGC_SIGHUP, STATS_COLLECTOR,
			gettext_noop("interval of flushing shard statistic."),
			NULL
		},
		&g_ShardInfoFlushInterval,
		300, 3, INT_MAX,
		NULL, NULL, NULL
	},
#endif
	{
		{"log_rotation_age", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Automatic log file rotation will occur after N minutes."),
			NULL,
			GUC_UNIT_MIN
		},
		&Log_RotationAge,
		HOURS_PER_DAY * MINS_PER_HOUR, 0, INT_MAX / SECS_PER_MINUTE,
		NULL, NULL, NULL
	},

	{
		{"log_rotation_size", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Automatic log file rotation will occur after N kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&Log_RotationSize,
		10 * 1024, 0, INT_MAX / 1024,
		NULL, NULL, NULL
	},
#ifdef __AUDIT__
	{
		{"alog_rotation_age", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Automatic audit log file rotation will occur after N minutes."),
			NULL,
			GUC_UNIT_MIN
		},
		&AuditLog_RotationAge,
		HOURS_PER_DAY * MINS_PER_HOUR, 0, INT_MAX / SECS_PER_MINUTE,
		NULL, NULL, NULL
	},
	{
		{"alog_rotation_size", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Automatic audit log file rotation will occur after N kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&AuditLog_RotationSize,
		10 * 1024, 0, INT_MAX / 1024,
		NULL, NULL, NULL
	},
	{
		{"alog_max_worker_number", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Max number of worker thead to read audit log from shared memory queue."),
			NULL,
		},
		&AuditLog_max_worker_number,
		16, 8, MAX_BACKENDS,
		NULL, NULL, NULL
	},
	{
		{"alog_common_queue_size", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Size of share memory queue for each backend to store common audit log, kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&AuditLog_common_log_queue_size_kb,
		64, 8, INT_MAX / 1024,
		NULL, NULL, NULL
	},
	{
		{"alog_fga_queue_size", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Size of share memory queue for each backend to store fga audit log, kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&AuditLog_fga_log_queue_size_kb,
		64, 8, INT_MAX / 1024,
		NULL, NULL, NULL
	},
	{
		{"alog_trace_queue_size", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Size of share memory queue for each backend to store trace audit log, kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&Maintain_trace_log_queue_size_kb,
		64, 8, INT_MAX / 1024,
		NULL, NULL, NULL
	},
	{
		{"alog_common_cache_size", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Size of common audit log local buffer for each audit worker, kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&AuditLog_common_log_cache_size_kb,
		64, 8, INT_MAX / 1024,
		NULL, NULL, NULL
	},
	{
		{"alog_fga_cacae_size", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Size of fga audit log local buffer for each audit worker, kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&AuditLog_fga_log_cacae_size_kb,
		64, 8, INT_MAX / 1024,
		NULL, NULL, NULL
	},
	{
		{"alog_trace_cache_size", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Size of trace audit log local buffer for each audit worker, kilobytes."),
			NULL,
			GUC_UNIT_KB
		},
		&Maintain_trace_log_cache_size_kb,
		64, 8, INT_MAX / 1024,
		NULL, NULL, NULL
	},
#endif
	{
		{"max_function_args", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the maximum number of function arguments."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&max_function_args,
		FUNC_MAX_ARGS, FUNC_MAX_ARGS, FUNC_MAX_ARGS,
		NULL, NULL, NULL
	},

	{
		{"max_index_keys", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the maximum number of index keys."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&max_index_keys,
		INDEX_MAX_KEYS, INDEX_MAX_KEYS, INDEX_MAX_KEYS,
		NULL, NULL, NULL
	},

	{
		{"max_identifier_length", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the maximum identifier length."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&max_identifier_length,
		NAMEDATALEN - 1, NAMEDATALEN - 1, NAMEDATALEN - 1,
		NULL, NULL, NULL
	},

	{
		{"block_size", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the size of a disk block."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&block_size,
		BLCKSZ, BLCKSZ, BLCKSZ,
		NULL, NULL, NULL
	},

	{
		{"segment_size", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the number of pages per disk file."),
			NULL,
			GUC_UNIT_BLOCKS | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&segment_size,
		RELSEG_SIZE, RELSEG_SIZE, RELSEG_SIZE,
		NULL, NULL, NULL
	},

	{
		{"wal_block_size", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the block size in the write ahead log."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&wal_block_size,
		XLOG_BLCKSZ, XLOG_BLCKSZ, XLOG_BLCKSZ,
		NULL, NULL, NULL
	},

	{
		{"wal_retrieve_retry_interval", PGC_SIGHUP, REPLICATION_STANDBY,
			gettext_noop("Sets the time to wait before retrying to retrieve WAL "
						 "after a failed attempt."),
			NULL,
			GUC_UNIT_MS
		},
		&wal_retrieve_retry_interval,
		5000, 1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"wal_segment_size", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the number of pages per write ahead log segment."),
			NULL,
			GUC_UNIT_XBLOCKS | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&wal_segment_size,
		(XLOG_SEG_SIZE / XLOG_BLCKSZ),
		(XLOG_SEG_SIZE / XLOG_BLCKSZ),
		(XLOG_SEG_SIZE / XLOG_BLCKSZ),
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"wal_track_entry_number", PGC_POSTMASTER, REPLICATION_STANDBY,
			gettext_noop("Number of entries to track GTS of each xlog segment."),
			NULL,
			GUC_UNIT_MS
		},
		&wal_gts_track_entries,
		256, 16, INT_MAX,
		NULL, NULL, NULL
	},
#endif
#ifdef USE_WHITEBOX_INJECTION

	{
		{"injection_stub_default_probability", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Global probablity that any transaction injection stub might trigger at."),
			NULL
		},
		&injection_stub_default_probability,
		PROBABILITY_LOWERBOUND, PROBABILITY_LOWERBOUND, PROBABILITY_UPPERBOUND,
		NULL, NULL, NULL
	},

	{
		{"injection_stub_default_sleep_time", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Global sleep time for any transaction injection stubs who triggers SLEEP failure types."),
			NULL
		},
		&injection_stub_default_sleep_time,
		SLEEPTIME_LOWERBOUND, SLEEPTIME_LOWERBOUND, SLEEPTIME_UPPERBOUND,
		NULL, NULL, NULL
	},
#endif
	{
		{"autovacuum_naptime", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Time to sleep between autovacuum runs."),
			NULL,
			GUC_UNIT_S
		},
		&autovacuum_naptime,
		60, 1, INT_MAX / 1000,
		NULL, NULL, NULL
	},
	{
		{"autovacuum_vacuum_threshold", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Minimum number of tuple updates or deletes prior to vacuum."),
			NULL
		},
		&autovacuum_vac_thresh,
		50, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"autovacuum_analyze_threshold", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Minimum number of tuple inserts, updates, or deletes prior to analyze."),
			NULL
		},
		&autovacuum_anl_thresh,
		50, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		/* see varsup.c for why this is PGC_POSTMASTER not PGC_SIGHUP */
		{"autovacuum_freeze_max_age", PGC_POSTMASTER, AUTOVACUUM,
			gettext_noop("Age at which to autovacuum a table to prevent transaction ID wraparound."),
			NULL
		},
		&autovacuum_freeze_max_age,
		/* see pg_resetwal if you change the upper-limit value */
		200000000, 100000, 2000000000,
		NULL, NULL, NULL
	},
	{
		/* see multixact.c for why this is PGC_POSTMASTER not PGC_SIGHUP */
		{"autovacuum_multixact_freeze_max_age", PGC_POSTMASTER, AUTOVACUUM,
			gettext_noop("Multixact age at which to autovacuum a table to prevent multixact wraparound."),
			NULL
		},
		&autovacuum_multixact_freeze_max_age,
		400000000, 10000, 2000000000,
		NULL, NULL, NULL
	},
	{
		/* see max_connections */
		{"autovacuum_max_workers", PGC_POSTMASTER, AUTOVACUUM,
			gettext_noop("Sets the maximum number of simultaneously running autovacuum worker processes."),
			NULL
		},
		&autovacuum_max_workers,
		3, 1, MAX_BACKENDS,
		check_autovacuum_max_workers, NULL, NULL
	},
	{
		{"max_parallel_workers_per_gather", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("Sets the maximum number of parallel processes per executor node."),
			NULL,
			GUC_EXPLAIN
		},
		&max_parallel_workers_per_gather,
		2, 0, MAX_PARALLEL_WORKERS,
		NULL, NULL, NULL
	},

	{
		{"max_parallel_workers", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("Sets the maximum number of parallel workers that can be active at one time."),
			NULL,
			GUC_EXPLAIN
		},
		&max_parallel_workers,
		MAX_PARALLEL_WORKER_LIMIT, 0, MAX_PARALLEL_WORKER_LIMIT,
		NULL, NULL, NULL
	},

	{
		{"union_limit_pushdown", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Threshold of limit count for union with order by and limit."
						 "The value 0 means there is no limit number."),
			NULL,
			GUC_EXPLAIN
		},
		&union_limit_pushdown,
		10000, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"max_result_cache_memory", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("The maximum memory of result cache can be used."),
			NULL
		},
		&max_result_cache_memory,
		16777216, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"nestloop_deviation_factor", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("The deviation factor threshold between the estimated number of rows and "
						"the actual number of rows in the outer loop of the nested loop, along with "
						"nestloop_deviation_threshold, determines whether a deviation alert should be triggered."),
			NULL,
			GUC_EXPLAIN
		},
		&nestloop_deviation_factor,
		3, 1, 10,
		NULL, NULL, NULL
	},

	{
		{"nestloop_deviation_threshold", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("The deviation threshold between the estimated number of rows and "
						"the actual number of rows in the outer loop of the nested loop, "
						"along with nestloop_deviation_factor, determines whether "
						"a deviation alert should be triggered."),
			NULL,
			GUC_EXPLAIN
		},
		&nestloop_deviation_threshold,
		100000, 1000, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"nestloop_outer_rows_threshold", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("The row count alert threshold for the outer loop of the nested loop."),
			NULL,
			GUC_EXPLAIN
		},
		&nestloop_outer_rows_threshold,
		100000, 1000, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"nestloop_inner_rows_threshold", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("The row count alert threshold for the inner loop of the nested loop."),
			NULL,
			GUC_EXPLAIN
		},
		&nestloop_inner_rows_threshold,
		10000, 100, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"hashjoin_inner_rows_factor", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("The inner loop exceeds the outer loop by a multiple factor in hash join, "
						"along with hashjoin_inner_rows_threshold to detemine whether an alert "
						"should be triggered"),
			NULL,
			GUC_EXPLAIN
		},
		&hashjoin_inner_rows_factor,
		10, 1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"hashjoin_inner_rows_threshold", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("The row count alert threshold for hashjoin inner loop, along with "
						"hashjoin_inner_rows_factor to detemine whether an alert should be triggered"),
			NULL,
			GUC_EXPLAIN
		},
		&hashjoin_inner_rows_threshold,
		100000, 100, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"autovacuum_work_mem", PGC_SIGHUP, RESOURCES_MEM,
			gettext_noop("Sets the maximum memory to be used by each autovacuum worker process."),
			NULL,
			GUC_UNIT_KB
		},
		&autovacuum_work_mem,
		-1, -1, MAX_KILOBYTES,
		check_autovacuum_work_mem, NULL, NULL
	},

	{
		{"old_snapshot_threshold", PGC_POSTMASTER, RESOURCES_ASYNCHRONOUS,
			gettext_noop("Time before a snapshot is too old to read pages changed after the snapshot was taken."),
			gettext_noop("A value of -1 disables this feature."),
			GUC_UNIT_MIN
		},
		&old_snapshot_threshold,
		-1, -1, MINS_PER_HOUR * HOURS_PER_DAY * 60,
		NULL, NULL, NULL
	},

	{
		{"tcp_keepalives_idle", PGC_USERSET, CLIENT_CONN_OTHER,
			gettext_noop("Time between issuing TCP keepalives."),
			gettext_noop("A value of 0 uses the system default."),
			GUC_UNIT_S
		},
		&tcp_keepalives_idle,
		0, 0, INT_MAX,
		NULL, assign_tcp_keepalives_idle, show_tcp_keepalives_idle
	},

	{
		{"tcp_keepalives_interval", PGC_USERSET, CLIENT_CONN_OTHER,
			gettext_noop("Time between TCP keepalive retransmits."),
			gettext_noop("A value of 0 uses the system default."),
			GUC_UNIT_S
		},
		&tcp_keepalives_interval,
		0, 0, INT_MAX,
		NULL, assign_tcp_keepalives_interval, show_tcp_keepalives_interval
	},

	{
		{"ssl_renegotiation_limit", PGC_USERSET, CONN_AUTH_SECURITY,
			gettext_noop("SSL renegotiation is no longer supported; this can only be 0."),
			NULL,
			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE,
		},
		&ssl_renegotiation_limit,
		0, 0, 0,
		NULL, NULL, NULL
	},

	{
		{"tcp_keepalives_count", PGC_USERSET, CLIENT_CONN_OTHER,
			gettext_noop("Maximum number of TCP keepalive retransmits."),
			gettext_noop("This controls the number of consecutive keepalive retransmits that can be "
						 "lost before a connection is considered dead. A value of 0 uses the "
						 "system default."),
		},
		&tcp_keepalives_count,
		0, 0, INT_MAX,
		NULL, assign_tcp_keepalives_count, show_tcp_keepalives_count
	},

	{
		{"gin_fuzzy_search_limit", PGC_USERSET, CLIENT_CONN_OTHER,
			gettext_noop("Sets the maximum allowed result for exact search by GIN."),
			NULL,
			0
		},
		&GinFuzzySearchLimit,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"effective_cache_size", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's assumption about the size of the disk cache."),
			gettext_noop("That is, the portion of the kernel's disk cache that "
						 "will be used for PostgreSQL data files. This is measured in disk "
						 "pages, which are normally 8 kB each."),
			GUC_UNIT_BLOCKS | GUC_EXPLAIN,
		},
		&effective_cache_size,
		DEFAULT_EFFECTIVE_CACHE_SIZE, 1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"min_parallel_table_scan_size", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the minimum amount of table data for a parallel scan."),
			gettext_noop("If the planner estimates that it will read a number of table pages too small to reach this limit, a parallel scan will not be considered."),
			GUC_UNIT_BLOCKS | GUC_EXPLAIN,
		},
		&min_parallel_table_scan_size,
		(8 * 1024 * 1024) / BLCKSZ, 0, INT_MAX / 3,
		NULL, NULL, NULL
	},

	{
		{"min_parallel_index_scan_size", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the minimum amount of index data for a parallel scan."),
			gettext_noop("If the planner estimates that it will read a number of index pages too small to reach this limit, a parallel scan will not be considered."),
			GUC_UNIT_BLOCKS | GUC_EXPLAIN,
		},
		&min_parallel_index_scan_size,
		(512 * 1024) / BLCKSZ, 0, INT_MAX / 3,
		NULL, NULL, NULL
	},

	{
		{"parallel_dml_tuple_num_threshold", PGC_USERSET, QUERY_TUNING_COST,
		 gettext_noop("Sets the tuple number threshold for parallel dml."),
		 gettext_noop("Sets the tuple number threshold for parallel dml, is this is valid parallel worker is forced set to max_parallel_workers_per_gather in compute_parallel_worker."),
		 GUC_UNIT_BLOCKS | GUC_EXPLAIN,
		},
		&parallel_dml_tuple_num_threshold,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
	
	{
		/* Can't be set in postgresql.conf */
		{"server_version_num", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the server version as an integer."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&server_version_num,
		PG_VERSION_NUM, PG_VERSION_NUM, PG_VERSION_NUM,
		NULL, NULL, NULL
	},

	{
		{"max_global_index_scan_rows_size", PGC_USERSET, QUERY_TUNING_COST,
		 gettext_noop("Sets the maximum amount of rows for a global index scan."),
		 gettext_noop("If the planner estimates that it will read rows larger than this limit, global index scan will not be considered.")
		},
		&max_global_index_scan_rows_size,
		2, 0, INT_MAX / 3,
		NULL, NULL, NULL
	},

	{
		{"log_temp_files", PGC_SUSET, LOGGING_WHAT,
			gettext_noop("Log the use of temporary files larger than this number of kilobytes."),
			gettext_noop("Zero logs all files. The default is -1 (turning this feature off)."),
			GUC_UNIT_KB
		},
		&log_temp_files,
		-1, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"track_activity_query_size", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Sets the size reserved for pg_stat_activity.query, in bytes."),
			NULL,

			/*
			 * There is no _bytes_ unit, so the user can't supply units for
			 * this.
			 */
		},
		&pgstat_track_activity_query_size,
		1024, 100, 102400,
		NULL, NULL, NULL
	},
	{
		{"track_activity_statement_size", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Sets the size reserved for pg_stat_activity.statement, in bytes."),
			NULL,

			/*
			 * There is no _bytes_ unit, so the user can't supply units for
			 * this.
			 */
		},
		&pgstat_track_statement_query_size,
		1024, 100, 102400,
		NULL, NULL, NULL
	},
	{
		{"pgstat_inq_interval", PGC_USERSET, STATS_COLLECTOR,
			gettext_noop("How often to ping the collector for a new file; in milliseconds."),
			NULL,

		},
		&pgstat_inq_interval,
		640, 100, 10000,
		NULL, NULL, NULL
	},
#ifdef PGXC
	{
		{"sequence_range", PGC_USERSET, COORDINATORS,
			gettext_noop("The range of values to ask from GTM for sequences. "
			             "If CACHE parameter is set then that overrides this."),
			NULL,
		},
		&SequenceRangeVal,
		1000, 1, INT_MAX,
		NULL, NULL, NULL
	},

#ifdef __OPENTENBASE__
	{
		{"pool_conn_keepalive", PGC_SIGHUP, DATA_NODES,
			gettext_noop("Close connections if they are idle in the pool for that time."),
			gettext_noop("A value of -1 turns autoclose off."),
			GUC_UNIT_S
		},
		&PoolConnKeepAlive,
		60, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"pool_maintenance_timeout", PGC_SIGHUP, DATA_NODES,
			gettext_noop("Launch maintenance routine if pooler idle for that time."),
			gettext_noop("A value of -1 turns feature off."),
			GUC_UNIT_S
		},
		&PoolMaintenanceTimeout,
		10, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"pool_cancel_timeout", PGC_SIGHUP, COORDINATORS,
			gettext_noop("Timeout of the pool cancel connections to other nodes."),
			gettext_noop("Min values is 0, turns feature off"),
			GUC_UNIT_S
		},
		&PoolCancelQueryTimeout,
		60, 0, 7200,
		NULL, NULL, NULL
	},

	{
		{"max_pool_size", PGC_POSTMASTER, DATA_NODES,
			gettext_noop("Max pool size for all databases."),
			gettext_noop("If number of active connections reaches this value, "
						 "other connection requests will be refused")
		},
		&MaxPoolSize,
		300, 1, 65535,
		NULL, NULL, NULL
	},
	{
		{"min_free_size", PGC_POSTMASTER, DATA_NODES,
		 	gettext_noop("total minimal pool free connection number for all databases.")
		},
		&MinFreeSize,
		50, 1, 65535,
		NULL, NULL, NULL
	},
	{
		{"min_free_size_per_db", PGC_POSTMASTER, DATA_NODES,
			 gettext_noop("minimal pool free connection number for per database."),
			 gettext_noop("When pool need to acquire new connections, we use the number as step ")
		},
		&MinFreeSizePerDb,
		5, 1, 65535,
		NULL, NULL, NULL
	},
	{
		{"pool_session_context_check_gap", PGC_SIGHUP, DATA_NODES,
			gettext_noop("Gap to check datanode session memory context."),
			gettext_noop("In seconds."),
			GUC_UNIT_S
		},
		&PoolSizeCheckGap,
		120, 10, 7200,
		NULL, NULL, NULL
	},
	{
		{"pool_session_max_lifetime", PGC_SIGHUP, DATA_NODES,
			gettext_noop("Datanode session max lifetime."),
			gettext_noop("Session will be colsed when expired."),
			GUC_UNIT_S
		},
		&PoolConnMaxLifetime,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"pool_session_memory_limit", PGC_SIGHUP, DATA_NODES,
			gettext_noop("Datanode session max memory context size."),
			gettext_noop("Exceed limit will be closed."),
			GUC_UNIT_S
		},
		&PoolMaxMemoryLimit,
		10, 1, 10000,
		NULL, NULL, NULL
	},	
	{
		{"pooler_connect_timeout", PGC_POSTMASTER, DATA_NODES,
			gettext_noop("Pooler connection timeout."),
			gettext_noop("Pooler connection timeout."),
			GUC_UNIT_S
		},
		&PoolConnectTimeOut,
		10, 1, 3600,
		NULL, NULL, NULL
	},	
	{
		{"pooler_scale_factor", PGC_POSTMASTER, DATA_NODES,
			gettext_noop("Pooler scale factor."),
			gettext_noop("Pooler scale factor.")
		},
		&PoolScaleFactor,
		2, 1, 64,
		NULL, NULL, NULL
	},	
	{
		{"pooler_dn_set_timeout", PGC_SIGHUP, DATA_NODES,
			gettext_noop("Pooler datanode set query timeout."),
			gettext_noop("Pooler datanode set query timeout."),
			GUC_UNIT_S
		},
		&PoolDNSetTimeout,
		10, 1, 3600,
		NULL, NULL, NULL
	},
	{
		{"pool_print_stat_timeout", PGC_SIGHUP, DATA_NODES,
			gettext_noop("Enable pooler print stat info."),
			gettext_noop("A value of -1 turns feature off."),
			GUC_UNIT_S
		},
		&PoolPrintStatTimeout,
		-1, -1, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"session_memory_size", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Used to get the total memory size of the session, in M Bytes."),
			gettext_noop("Used to get the total memory size of the session, in M Bytes.")
		},
		&g_TotalMemorySize,
		0, 0, INT_MAX,
		NULL, NULL, show_total_memorysize
	},
#endif
	{
		{"pooler_port", PGC_POSTMASTER, DATA_NODES,
			gettext_noop("Port of the Pool Manager."),
			NULL
		},
		&PoolerPort,
		6667, 1, 65535,
		NULL, NULL, NULL
	},
#ifdef XCP
	{
		{"parentPGXCPid", PGC_USERSET, UNGROUPED,
			gettext_noop("PID of the remote process attached to this session."),
			gettext_noop("This GUC only makes sense when a coordinator or a "
					"datanode has opened the session"),
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_AUTO_FILE | GUC_DISALLOW_IN_FILE | GUC_NO_SHOW_ALL
		},
		&parentPGXCPid,
		-1, -1, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"pgxl_remote_fetch_size", PGC_USERSET, UNGROUPED,
			gettext_noop("Number of maximum tuples to fetch in one remote iteration"),
			NULL,
			0
		},
		&PGXLRemoteFetchSize,
		1000, 1, INT_MAX,
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"archive_autowake_interval", PGC_USERSET, WAL_ARCHIVING,
			gettext_noop("how often to force a poll of the archive status directory in seconds."),
		},
		&archive_autowake_interval,
		30, 1, 60,
		NULL, NULL, NULL
	},
	{
		{"datarow_buffer_size", PGC_SIGHUP, CUSTOM_OPTIONS,
			gettext_noop("buffer size for prefetch."),
		},
		&DataRowBufferSize,
		32, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"replication_level", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("replication level on join to make Query more efficient."),
			NULL,
			GUC_EXPLAIN
		},
		&replication_level,
		5, 0, INT_MAX,
		NULL, NULL, NULL
	},
#endif
#ifdef __TWO_PHASE_TESTS__
    {
        {"twophase_exception_case", PGC_USERSET, CUSTOM_OPTIONS,
            gettext_noop("run tests for twophase transaction"),
            NULL
        },
        &twophase_exception_case,
        0, 0, INT_MAX,
        NULL, NULL, NULL
    },
    {
        {"run_pg_clean", PGC_USERSET, CUSTOM_OPTIONS,
            gettext_noop("run tests on pg_clean"),
            NULL
        },
        &run_pg_clean,
        0, 0, 10,
        NULL, NULL, NULL
    },
#endif
#ifdef __STORAGE_SCALABLE__
	{
		{"pub_stat_hash_size", PGC_SIGHUP, RESOURCES,
			gettext_noop("size of hashtable used in publication statistics."),
			NULL
		},
		&g_PubStatHashSize,
		65536, 8192, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"pub_table_stat_hash_size", PGC_SIGHUP, RESOURCES,
			gettext_noop("size of hashtable used in publication's table statistics."),
			NULL
		},
		&g_PubTableStatHashSize,
		262144, 8192, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"sub_stat_hash_size", PGC_SIGHUP, RESOURCES,
			gettext_noop("size of hashtable used in subscription statistics."),
			NULL
		},
		&g_SubStatHashSize,
		65536, 8192, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"sub_table_stat_hash_size", PGC_SIGHUP, RESOURCES,
			gettext_noop("size of hashtable used in subscription's table statistics."),
			NULL
		},
		&g_SubTableStatHashSize,
		262144, 8192, INT_MAX,
		NULL, NULL, NULL
	},
#endif
#endif
#endif /* PGXC */

	{
		{"gin_pending_list_limit", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the maximum size of the pending list for GIN index."),
			NULL,
			GUC_UNIT_KB
		},
		&gin_pending_list_limit,
		4096, 64, MAX_KILOBYTES,
		NULL, NULL, NULL
	},

#ifdef __OPENTENBASE_C__	
	{
		{"result_cache_partition_number", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Set the number of partition for result cache."),
			NULL
		},
		&result_cache_partition_number,
		1024, 1, 1024,
		NULL, NULL, NULL
	},
	{
		{"result_cache_number_per_partition", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Set the number of result cache entry in a partition."),
			NULL		},
		&result_cache_number_per_partition,
		8, 1, 16,
		NULL, NULL, NULL
	},
	{
		{"max_size_per_cached_result", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Set max size of a cached result."),
			NULL,
			GUC_UNIT_KB
		},
		&max_size_per_cached_result,
		16, 0, 64,
		NULL, NULL, NULL
	},
	{
		{"forward_port", PGC_SIGHUP, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the TCP port the forward process listens on."),
			NULL
		},
		&ForwardPortNumber,
		6669, 0, 65535,
		NULL, NULL, NULL
	},
	{
		{"max_handles_per_node", PGC_SUSET, RESOURCES_KERNEL,
			gettext_noop("max handles per nodes."),
			NULL
		},
		&max_handles,
		DEFAULT_MAX_HANDLES, 1, INT_MAX,
		check_max_handles, assign_max_handles, NULL
	},
#endif

#ifdef __TWO_PHASE_TRANS__
	{
		{"record_2pc_cache_size", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("2PC info cache size."),
		},
		&record_2pc_cache_size,
		4096, 32, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"record_2pc_entry_size", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("2PC info cache entry size."),
		},
		&record_2pc_entry_size,
		2048, 1028, INT_MAX,
		NULL, NULL, NULL
	},
#endif

#ifdef __OPENTENBASE__
    {
	    {"hash_search_columns_threshold", PGC_USERSET, CUSTOM_OPTIONS,
            gettext_noop("If the number of columns in the table greater than it, use hashing algorithm"
                         " to optimize wide tables"),
	    },
	    &hash_search_columns_threshold,
	    60, 1, 1600,
	    NULL, NULL, NULL
	},
#endif

	{
		{"auto_clean_2pc_interval", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("auto clean 2pc interval"),
			NULL,
			GUC_UNIT_S
		},
		&auto_clean_2pc_interval,
#ifdef __TWO_PHASE_TESTS__
		30, 1, INT_MAX,
#else
		30, 10, INT_MAX,
#endif
		NULL, NULL, NULL
	},

	{
		{"auto_clean_2pc_delay", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("auto clean 2pc delay"),
			NULL,
			GUC_UNIT_S
		},
		&auto_clean_2pc_delay,
#ifdef __TWO_PHASE_TESTS__
		30, 1, INT_MAX,
#else
		30, 10, INT_MAX,
#endif
		NULL, NULL, NULL
	},

	{
		{"auto_clean_2pc_timeout", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("auto clean 2pc timeout"),
			NULL,
			GUC_UNIT_S
		},
		&auto_clean_2pc_timeout,
#ifdef __TWO_PHASE_TESTS__
		180, 1, INT_MAX,
#else
		180, 30, INT_MAX,
#endif
		NULL, NULL, NULL
	},

	{
		{"auto_clean_2pc_max_check_time", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("auto clean 2pc max check time"),
			NULL,
			GUC_UNIT_S
		},
		&auto_clean_2pc_max_check_time,
#ifdef __TWO_PHASE_TESTS__
		180, 1, INT_MAX,
#else
		180, 30, INT_MAX,
#endif
		NULL, NULL, NULL
	},

	{
		{"reconnect_gtm_retry_times", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("reconnect gtm retry times"),
			NULL
		},
		&reconnect_gtm_retry_times,
		3, 0, 100,
		NULL, NULL, NULL
	},

	{
		{"reconnect_gtm_retry_interval", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("reconnect gtm retry interval"),
			NULL,
			GUC_UNIT_MS
		},
		&reconnect_gtm_retry_interval,
		500, 0, 60000,
		NULL, NULL, NULL
	},
	{
		{"gts_track_segment", PGC_POSTMASTER, CUSTOM_OPTIONS,
			 gettext_noop("Set the number of max track gts in memory"),
		},
		&gts_track_segment,
		128, 16, 2048,
		NULL, NULL, NULL
	},
        {
                {"copy_reject_percent_threshold", PGC_USERSET, CUSTOM_OPTIONS,
                 gettext_noop("Reject limit in percent starts calculating after this number of rows processed"),
                 NULL
                },
                &copy_reject_percent_threshold,
                300, 0, INT_MAX,
                NULL, NULL, NULL
        },
        {
                {"copy_initial_bad_row_limit", PGC_USERSET, CUSTOM_OPTIONS,
                 gettext_noop("Stops processing when number of the first bad rows exceeding this value"),
                 NULL
                },
                &copy_initial_bad_row_limit,
                1000, 0, INT_MAX,
                NULL, NULL, NULL
        },
	{
		{"writable_external_table_bufsize", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Buffer size in kilobytes for writable external table before writing data to TDX."),
			gettext_noop("Valid value is between 32K and 128M: [32, 131072]."),
			GUC_UNIT_KB | GUC_NOT_IN_SAMPLE
		},
		&writable_external_table_bufsize,
		16384, 32, 131072,
		NULL, NULL, NULL
	},
	{
			{"tdx_external_max_segs", PGC_USERSET, CUSTOM_OPTIONS,
			 gettext_noop("Maximum number of segments that connect to a single tdx URL."),
			 NULL
			},
			&tdx_external_max_segs,
			256, 1, INT_MAX,
			NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
    {
        {"global_deadlock_detector_mode", PGC_SIGHUP, CUSTOM_OPTIONS,
         gettext_noop("set the global deadlock detector running mode, 0: do not open deadlock detection, "
                      "1: choose a coordinator node to run deadlock detection, "
                      "2: the coordinator node configured as 2 turns on deadlock detection."),
         NULL
        },
        &global_deadlock_detector_mode,
        1, 0, 2,
        NULL, NULL, NULL
    },

    {
        {"global_deadlock_detector_period", PGC_SIGHUP, CUSTOM_OPTIONS,
         gettext_noop("set the executing period of global deadlock detector backend."),
         NULL,
         GUC_UNIT_S
        },
        &global_deadlock_detector_period,
        10, 5, INT_MAX,
        NULL, NULL, NULL
    },

    {
        {"log_min_duration_detection", PGC_SIGHUP, LOGGING_WHEN,
         gettext_noop("Sets the minimum execution time above which "
                      "global deadlock detection will be logged."),
         gettext_noop("Zero prints all queries. -1 turns this feature off."),
         GUC_UNIT_S
        },
        &log_min_duration_detection,
        10, -1, INT_MAX,
        NULL, NULL, NULL
    },
#endif
	{
		{"resource_group_cpu_priority", PGC_POSTMASTER, RESOURCES,
			gettext_noop("Sets the cpu priority for postgres processes when resource group is enabled."),
			NULL
		},
		&resource_group_cpu_priority,
		10, 1, 256,
		NULL, NULL, NULL
	},

	{
		{"resource_group_queuing_timeout", PGC_USERSET, RESOURCES,
			gettext_noop("A transaction gives up on queuing on a resource group after this timeout (in ms)."),
			NULL,
			GUC_UNIT_MS
		},
		&resource_group_queuing_timeout,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"resgroup_memory_query_fixed_mem", PGC_USERSET, RESOURCES,
			gettext_noop("Sets the fixed amount of memory reserved for a query."),
			NULL,
			GUC_UNIT_KB
		},
		&resgroup_memory_query_fixed_mem,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"tcp_user_timeout", PGC_USERSET, CLIENT_CONN_OTHER,
			gettext_noop("TCP user timeout."),
			gettext_noop("A value of 0 uses the system default."),
			GUC_UNIT_MS
		},
		&tcp_user_timeout,
		0, 0, INT_MAX,
		NULL, assign_tcp_user_timeout, show_tcp_user_timeout
	},

	/* End-of-list marker */
	{
		{"data_skew_option", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Data skew method option. 0:disable	1: only enable roundrobin"
				       "2:only enable partial broadcast	3: enable all"),
			NULL,
			GUC_EXPLAIN
		},
		&data_skew_option,
		0, 0, 3,
		NULL, NULL, NULL
	},

	{
		{"upgrade_mode", PGC_SIGHUP, UPGRADE_OPTIONS,
			gettext_noop("Indicate the upgrade mode: inplace upgrade mode or not in upgrade."),
			NULL
		},
		&upgrade_mode,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"hybrid_sort_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Indicate how much memory we can use at a btach,"
			"recommended setting is equal to L3 cache"),
			NULL,
			GUC_UNIT_KB | GUC_EXPLAIN
		},
		&hybrid_sort_mem,
		65535, 64, MAX_KILOBYTES,
		NULL, NULL, NULL
	},
	{
		{"forward_send_naptime", PGC_SIGHUP, CUSTOM_OPTIONS,
			gettext_noop("Time to sleep between forward sender runs."),
			NULL,
			GUC_UNIT_MS
		},
		&FnSenderDelay,
		1, 1, INT_MAX / 1000,
		NULL, NULL, NULL
	},
	{
		{"fn_send_bulk_size", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("Time to sleep between forward sender runs."),
			NULL,
			GUC_UNIT_KB
		},
		&FnSendBulkSize,
		4 * 1024, 1, 32 * 1024,
		NULL, NULL, NULL
	},
	{
		{"fn_send_thread_num", PGC_POSTMASTER, RESOURCES,
			gettext_noop("The num of threads for forward sender runs."),
			gettext_noop("-1 disables fn sender multi thread."),
			GUC_UNIT_MS
		},
		&fn_send_thread_num,
		-1, -1, 64,
		NULL, NULL, NULL
	},
	{
		{"fn_recv_thread_num", PGC_POSTMASTER, RESOURCES,
			gettext_noop("The num of threads for forward recver runs."),
			gettext_noop("-1 disables fn recver multi thread."),
			GUC_UNIT_MS
		},
		&fn_recv_thread_num,
		-1, -1, 64,
		NULL, NULL, NULL
	},
	{
		{"fn_buffer_queue_len", PGC_SIGHUP, CUSTOM_OPTIONS,
			gettext_noop("The queue num for thread of forward sender comsume."),
			NULL,
			GUC_UNIT_MS
		},
		&fn_buffer_queue_len,
		1024, 1, INT_MAX / 1000,
		NULL, NULL, NULL
	},

	{
		{"calculate_db_size_worker_number", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Determine the number of workers used to calculate the size of the database."),
			NULL
		},
		&calc_db_size_worker_num,
		10, 1, 1024,
		NULL, NULL, NULL
	},

	{
		{"calculate_db_size_slice_number", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("Determine the number of slices used to calculate the size of the database."),
			NULL
		},
		&calc_db_size_slice_num,
		1000, 10, INT_MAX,
		NULL, NULL, NULL
	},

#ifdef __OPENTENBASE_C__
	{
		{"pg_workfile_max_entries", PGC_POSTMASTER, RESOURCES,
			gettext_noop("Sets the maximum number of entries that can be stored in the workfile directory"),
			NULL,
			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
		},
		&pg_workfile_max_entries,
		864000, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"pg_workfile_limit_files_per_query", PGC_USERSET, RESOURCES,
			gettext_noop("Maximum number of workfiles allowed per query per datanode."),
			gettext_noop("0 for no limit. Current query is terminated when limit is exceeded.")
		},
		&pg_workfile_limit_files_per_query,
		200000, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"pg_workfile_limit_per_datanode", PGC_POSTMASTER, RESOURCES,
			gettext_noop("Maximum disk space (in KB) used for workfiles per datanode."),
			gettext_noop("0 for no limit. Current query is terminated when limit is exceeded."),
			GUC_UNIT_KB
		},
		&pg_workfile_limit_per_datanode,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"pg_workfile_limit_per_query", PGC_USERSET, RESOURCES,
			gettext_noop("Maximum disk space (in KB) used for workfiles per query per datanode."),
			gettext_noop("0 for no limit. Current query is terminated when limit is exceeded."),
			GUC_UNIT_KB
		},
		&pg_workfile_limit_per_query,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},
	{
		{"max_remote_query_fetch", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("max tuples which remote query can fetch"),
			NULL
		},
		&max_remote_query_fetch,
		10000, 0, INT_MAX,
		NULL, NULL, NULL
	},
#endif
	{
		{"xact_autoanalyze_naptime", PGC_USERSET, STATS,
			gettext_noop("The time interval for triggering analyze within a transaction."),
			gettext_noop("0 for no time interval limit between two analyze"),
			GUC_UNIT_MS
		},
		&xact_autoanalyze_naptime,
		0, 0, INT_MAX,
		NULL, NULL, NULL
	},

	{
		{"optimize_distinct_subquery", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("Enable postponing subquery execution in distinct."
						 "0 : execute subquery in distinct with distinct evaluation."
						 "1 : (default) execute subquery after distinct evaluation when referring"
						 "    variables of subquery in the target list."
						 "2 : execute subquery after distinct evaluation even referring variables"
						 "    of subquery not in the target list."),
			NULL
		},
		&optimize_distinct_subquery,
		1, 0, 2,
		NULL, NULL, NULL
	},

	{
		{"proc_max_planstate", PGC_POSTMASTER, CUSTOM_OPTIONS,
			gettext_noop("max length for process planstate"),
			NULL
		},
		&proc_max_planstate,
		1024, 2, INT_MAX,
		NULL, NULL, NULL
	},

	/* unused guc */
	{
		{"page_ts_need_xlog", PGC_SIGHUP, REPLICATION_MASTER,
			gettext_noop("Determine whether the page timestamp should be logged."),
			NULL
		},
		&obsolete_int_guc,
		0, 0, 1,
		check_unused_int_guc_set, NULL, NULL
	},

	{
		{"parallel_workers_multiplier", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
			gettext_noop("Multiple of max_parallel_workers_per_gather for special optimization."),
			NULL,
			GUC_EXPLAIN
		},
		&obsolete_int_guc,
		0, 0, 10,
		check_unused_int_guc_set, NULL, NULL
	},


	/* End-of-list marker */
	{
		{NULL, 0, 0, NULL, NULL}, NULL, 0, 0, 0, NULL, NULL, NULL
	}
};

static struct config_real ConfigureNamesReal[] =
{
	{
		{"seq_page_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of a "
						 "sequentially fetched disk page."),
			NULL,
			GUC_EXPLAIN
		},
		&seq_page_cost,
		DEFAULT_SEQ_PAGE_COST, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"random_page_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of a "
						 "nonsequentially fetched disk page."),
			NULL,
			GUC_EXPLAIN
		},
		&random_page_cost,
		DEFAULT_RANDOM_PAGE_COST, 0, DBL_MAX,
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE_C__
	{
		{"replication_threshold", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("replication threshold on join to make Query more efficient."),
			NULL,
			GUC_EXPLAIN
		},
		&replication_threshold,
		DEFAULT_REPLICATION_THRESHOLD, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"conservative_selectivity", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("the multi-restriction selectivity calculation method ratio."),
			NULL,
			GUC_EXPLAIN
		},
		&conservative_selectivity,
		DEFAULT_CONSERVATIVE_SELECTIVITY, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"late_materialize_threshold", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("the selectivity threshold of late materialize path."),
			NULL,
			GUC_EXPLAIN
		},
		&late_materialize_threshold,
		DEFAULT_LATE_MATERIALIZE_THRESHOLD, 0, DBL_MAX,
		NULL, NULL, NULL
	},
#endif
	{
		{"cpu_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "processing each tuple (row)."),
			NULL,
			GUC_EXPLAIN
		},
		&cpu_tuple_cost,
		DEFAULT_CPU_TUPLE_COST, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"cpu_index_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "processing each index entry during an index scan."),
			NULL,
			GUC_EXPLAIN
		},
		&cpu_index_tuple_cost,
		DEFAULT_CPU_INDEX_TUPLE_COST, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"cpu_operator_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "processing each operator or function call."),
			NULL,
			GUC_EXPLAIN
		},
		&cpu_operator_cost,
		DEFAULT_CPU_OPERATOR_COST, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"parallel_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "passing each tuple (row) from worker to master backend."),
			NULL,
			GUC_EXPLAIN
		},
		&parallel_tuple_cost,
		DEFAULT_PARALLEL_TUPLE_COST, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"parallel_setup_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "starting up worker processes for parallel query."),
			NULL,
			GUC_EXPLAIN
		},
		&parallel_setup_cost,
		DEFAULT_PARALLEL_SETUP_COST, 0, DBL_MAX,
		NULL, NULL, NULL
	},
	{
		{"jit_above_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Perform JIT compilation if query is more expensive."),
			gettext_noop("-1 disables JIT compilation."),
			GUC_EXPLAIN
		},
		&jit_above_cost,
		100000, -1, DBL_MAX,
		NULL, NULL, NULL
	},
	
	{
		{"jit_optimize_above_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Optimize JITed functions if query is more expensive."),
			gettext_noop("-1 disables optimization."),
			GUC_EXPLAIN
		},
		&jit_optimize_above_cost,
		500000, -1, DBL_MAX,
		NULL, NULL, NULL
	},
	
	{
		{"jit_inline_above_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Perform JIT inlining if query is more expensive."),
			gettext_noop("-1 disables inlining."),
			GUC_EXPLAIN
		},
		&jit_inline_above_cost,
		500000, -1, DBL_MAX,
		NULL, NULL, NULL
	},

	{
		{"cursor_tuple_fraction", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Sets the planner's estimate of the fraction of "
						 "a cursor's rows that will be retrieved."),
			NULL,
			GUC_EXPLAIN
		},
		&cursor_tuple_fraction,
		DEFAULT_CURSOR_TUPLE_FRACTION, 0.0, 1.0,
		NULL, NULL, NULL
	},

#ifdef XCP
	{
		{"network_byte_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "sending data from remote node."),
			NULL,
			GUC_EXPLAIN
		},
		&network_byte_cost,
		DEFAULT_NETWORK_BYTE_COST, 0, DBL_MAX, NULL, NULL
	},

	{
		{"remote_query_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "setting up remote subquery."),
			NULL,
			GUC_EXPLAIN
		},
		&remote_query_cost,
		DEFAULT_REMOTE_QUERY_COST, 0, DBL_MAX, NULL, NULL
	},
#endif

#ifdef __OPENTENBASE_C__
	{
		{"fn_init_cost", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("Sets the planner's estimate of the cost of "
						 "setting up forward node communication."),
			NULL,
			GUC_EXPLAIN
		},
		&fn_init_cost,
		DEFAULT_FN_INIT_COST, 0, DBL_MAX, NULL, NULL
	},
#endif

	{
		{"geqo_selection_bias", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("GEQO: selective pressure within the population."),
			NULL,
			GUC_EXPLAIN
		},
		&Geqo_selection_bias,
		DEFAULT_GEQO_SELECTION_BIAS,
		MIN_GEQO_SELECTION_BIAS, MAX_GEQO_SELECTION_BIAS,
		NULL, NULL, NULL
	},
	{
		{"geqo_seed", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("GEQO: seed for random path selection."),
			NULL,
			GUC_EXPLAIN
		},
		&Geqo_seed,
		0.0, 0.0, 1.0,
		NULL, NULL, NULL
	},

	{
		{"hash_mem_multiplier", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Multiple of work_mem to use for hash tables."),
			NULL,
			GUC_EXPLAIN
		},
		&hash_mem_multiplier,
		1.0, 1.0, 1000.0,
		NULL, NULL, NULL
	},

	{
		{"bgwriter_lru_multiplier", PGC_SIGHUP, RESOURCES_BGWRITER,
			gettext_noop("Multiple of the average buffer usage to free per round."),
			NULL
		},
		&bgwriter_lru_multiplier,
		2.0, 0.0, 10.0,
		NULL, NULL, NULL
	},

	{
		{"seed", PGC_USERSET, UNGROUPED,
			gettext_noop("Sets the seed for random-number generation."),
			NULL,
			GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&phony_random_seed,
		0.0, -1.0, 1.0,
		check_random_seed, assign_random_seed, show_random_seed
	},

	{
		{"autovacuum_vacuum_scale_factor", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Number of tuple updates or deletes prior to vacuum as a fraction of reltuples."),
			NULL
		},
		&autovacuum_vac_scale,
		0.2, 0.0, 100.0,
		NULL, NULL, NULL
	},
	{
		{"autovacuum_analyze_scale_factor", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples."),
			NULL
		},
		&autovacuum_anl_scale,
		0.1, 0.0, 100.0,
		NULL, NULL, NULL
	},
	{
		{"autovacuum_schema_cleanup_factor", PGC_SIGHUP, AUTOVACUUM,
			gettext_noop("Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples."),
			NULL
		},
		&autovacuum_schema_cleanup_factor,
		1.0, 0.0, 1.0,
		NULL, NULL, NULL
	},
	{
		{"checkpoint_completion_target", PGC_SIGHUP, WAL_CHECKPOINTS,
			gettext_noop("Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval."),
			NULL
		},
		&CheckPointCompletionTarget,
		0.5, 0.0, 1.0,
		NULL, NULL, NULL
	},

	{
		{"distinct_pushdown_factor", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("The threshold factor of distinct pushdown"),
			NULL
		},
		&distinct_pushdown_factor,
		0.2, 0.0, 1.0,
		NULL, NULL, NULL
	},

#ifdef __OPENTENBASE_C__
	{
		{"agg_estimate_factor", PGC_USERSET, QUERY_TUNING_COST,
			gettext_noop("the factor used to estimate the num of distinct mindlessly."),
			NULL,
			GUC_EXPLAIN
		},
		&agg_estimate_factor,
		0.5, 0.0, 1.0,
		NULL, NULL, NULL
	},

#endif

	{
		{"resource_group_cpu_limit", PGC_POSTMASTER, RESOURCES,
			gettext_noop("Maximum percentage of CPU resources assigned to a cluster."),
			NULL
		},
		&resource_group_cpu_limit,
		0.9, 0.1, 1.0,
		NULL, NULL, NULL
	},
	
	{
		{"disable_cost", PGC_USERSET, QUERY_TUNING_METHOD,
			gettext_noop("The threshold factor of distinct pushdown"),
			NULL
		},
		&disable_cost,
		1.0e10, 0.0, 1.0e100,
		NULL, NULL, NULL
	},

	/* End-of-list marker */
	{
		{NULL, 0, 0, NULL, NULL}, NULL, 0.0, 0.0, 0.0, NULL, NULL, NULL
	}
};

static struct config_string ConfigureNamesString[] =
{
	{
		{"archive_command", PGC_SIGHUP, WAL_ARCHIVING,
			gettext_noop("Sets the shell command that will be called to archive a WAL file."),
			NULL
		},
		&XLogArchiveCommand,
		"",
		NULL, NULL, show_archive_command
	},

	{
		{"client_encoding", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the client's character set encoding."),
			NULL,
			GUC_IS_NAME | GUC_REPORT
		},
		&client_encoding_string,
		"SQL_ASCII",
		check_client_encoding, assign_client_encoding, NULL
	},

	{
		{"log_line_prefix", PGC_SIGHUP, LOGGING_WHAT,
			gettext_noop("Controls information prefixed to each log line."),
			gettext_noop("If blank, no prefix is used.")
		},
		&Log_line_prefix,
		"%m [%p] ",
		NULL, NULL, NULL
	},

	{
		{"log_timezone", PGC_SIGHUP, LOGGING_WHAT,
			gettext_noop("Sets the time zone to use in log messages."),
			NULL
		},
		&log_timezone_string,
		"GMT",
		check_log_timezone, assign_log_timezone, show_log_timezone
	},

	{
		{"DateStyle", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the display format for date and time values."),
			gettext_noop("Also controls interpretation of ambiguous "
						 "date inputs."),
			GUC_LIST_INPUT | GUC_REPORT
		},
		&datestyle_string,
		"ISO, MDY",
		check_datestyle, assign_datestyle, NULL
	},

	{
		{"default_tablespace", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the default tablespace to create tables and indexes in."),
			gettext_noop("An empty string selects the database's default tablespace."),
			GUC_IS_NAME
		},
		&default_tablespace,
		"",
		check_default_tablespace, NULL, NULL
	},

	{
		{"temp_tablespaces", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the tablespace(s) to use for temporary tables and sort files."),
			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE
		},
		&temp_tablespaces,
		"",
		check_temp_tablespaces, assign_temp_tablespaces, NULL
	},

	{
		{"dynamic_library_path", PGC_SUSET, CLIENT_CONN_OTHER,
			gettext_noop("Sets the path for dynamically loadable modules."),
			gettext_noop("If a dynamically loadable module needs to be opened and "
						 "the specified name does not have a directory component (i.e., the "
						 "name does not contain a slash), the system will search this path for "
						 "the specified file."),
			GUC_SUPERUSER_ONLY
		},
		&Dynamic_library_path,
		"$libdir",
		NULL, NULL, NULL
	},

	{
		{"krb_server_keyfile", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Sets the location of the Kerberos server key file."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&pg_krb_server_keyfile,
		PG_KRB_SRVTAB,
		NULL, NULL, NULL
	},

	{
		{"bonjour_name", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the Bonjour service name."),
			NULL
		},
		&bonjour_name,
		"",
		NULL, NULL, NULL
	},

	/* See main.c about why defaults for LC_foo are not all alike */

	{
		{"lc_collate", PGC_INTERNAL, CLIENT_CONN_LOCALE,
			gettext_noop("Shows the collation order locale."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&locale_collate,
		"C",
		NULL, NULL, NULL
	},

	{
		{"lc_ctype", PGC_INTERNAL, CLIENT_CONN_LOCALE,
			gettext_noop("Shows the character classification and case conversion locale."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&locale_ctype,
		"C",
		NULL, NULL, NULL
	},

	{
		{"lc_messages", PGC_SUSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the language in which messages are displayed."),
			NULL
		},
		&locale_messages,
		"",
		check_locale_messages, assign_locale_messages, NULL
	},

	{
		{"lc_monetary", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the locale for formatting monetary amounts."),
			NULL
		},
		&locale_monetary,
		"C",
		check_locale_monetary, assign_locale_monetary, NULL
	},

	{
		{"lc_numeric", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the locale for formatting numbers."),
			NULL
		},
		&locale_numeric,
		"C",
		check_locale_numeric, assign_locale_numeric, NULL
	},

	{
		{"lc_time", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the locale for formatting date and time values."),
			NULL
		},
		&locale_time,
		"C",
		check_locale_time, assign_locale_time, NULL
	},

	{
		{"session_preload_libraries", PGC_SUSET, CLIENT_CONN_PRELOAD,
			gettext_noop("Lists shared libraries to preload into each backend."),
			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
		},
		&session_preload_libraries_string,
		"",
		NULL, NULL, NULL
	},

	{
		{"shared_preload_libraries", PGC_POSTMASTER, CLIENT_CONN_PRELOAD,
			gettext_noop("Lists shared libraries to preload into server."),
			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
		},
		&shared_preload_libraries_string,
		"",
		NULL, NULL, NULL
	},

	{
		{"local_preload_libraries", PGC_USERSET, CLIENT_CONN_PRELOAD,
			gettext_noop("Lists unprivileged shared libraries to preload into each backend."),
			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE
		},
		&local_preload_libraries_string,
		"",
		NULL, NULL, NULL
	},

	{
		{"spm_set_hint", PGC_USERSET, CLIENT_CONN_PRELOAD,
			gettext_noop("Set hint list for SPM"),
			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE
		},
		&spm_set_hint,
		"enable_pullup_expr_agg_update,enable_pullup_agg_nonstrict,enable_pullup_expr_distinct,enable_pullup_target_casewhen,enable_pullup_expr_agg,enable_pullup_expr_agg_update_noqual,enable_pullup_subquery",
		NULL, NULL, NULL
	},

	{
		{"search_path", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the schema search order for names that are not schema-qualified."),
			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_EXPLAIN
		},
		&namespace_search_path,
		"\"$user\", public",
		check_search_path, assign_search_path, NULL
	},

	{
		/* Can't be set in postgresql.conf */
		{"server_encoding", PGC_INTERNAL, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the server (database) character set encoding."),
			NULL,
			GUC_IS_NAME | GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&server_encoding_string,
		"SQL_ASCII",
		NULL, NULL, NULL
	},

	{
		/* Can't be set in postgresql.conf */
		{"server_version", PGC_INTERNAL, PRESET_OPTIONS,
			gettext_noop("Shows the server version."),
			NULL,
			GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&server_version_string,
		PG_VERSION,
		NULL, NULL, NULL
	},

	{
		/* Not for general use --- used by SET ROLE */
		{"role", PGC_USERSET, UNGROUPED,
			gettext_noop("Sets the current role."),
			NULL,
			GUC_IS_NAME | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE | GUC_NOT_WHILE_SEC_REST
		},
		&role_string,
		"none",
		check_role, assign_role, show_role
	},

	{
		/* Not for general use --- used by SET SESSION AUTHORIZATION */
		{"session_authorization", PGC_USERSET, UNGROUPED,
			gettext_noop("Sets the session user name."),
			NULL,
			GUC_IS_NAME | GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE | GUC_NOT_WHILE_SEC_REST
		},
		&session_authorization_string,
		NULL,
		check_session_authorization, assign_session_authorization, NULL
	},

#ifdef XCP
	{
		{"global_session", PGC_USERSET, UNGROUPED,
			gettext_noop("Sets the global session identifier."),
			NULL,
			GUC_IS_NAME | GUC_REPORT | GUC_NO_RESET_ALL | GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE | GUC_NOT_WHILE_SEC_REST
		},
		&global_session_string,
		"none",
		check_global_session, assign_global_session, NULL
	},
#endif

	{
		{"log_destination", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the destination for server log output."),
			gettext_noop("Valid values are combinations of \"stderr\", "
						 "\"syslog\", \"csvlog\", and \"eventlog\", "
						 "depending on the platform."),
			GUC_LIST_INPUT
		},
		&Log_destination_string,
		"stderr",
		check_log_destination, assign_log_destination, NULL
	},
	{
		{"log_directory", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the destination directory for log files."),
			gettext_noop("Can be specified as relative to the data directory "
						 "or as absolute path."),
			GUC_SUPERUSER_ONLY
		},
		&Log_directory,
		"log",
		check_canonical_path, NULL, NULL
	},
	{
		{"log_filename", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the file name pattern for log files."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&Log_filename,
		"postgresql-%Y-%m-%d_%H%M%S.log",
		NULL, NULL, NULL
	},
#ifdef __AUDIT__
	{
		{"alog_filename", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the file name pattern for audit log files."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&AuditLog_filename,
		"audit-%A-%H.csv",
		NULL, NULL, NULL
	},
#endif
	{
		{"syslog_ident", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the program name used to identify PostgreSQL "
						 "messages in syslog."),
			NULL
		},
		&syslog_ident_str,
		"postgres",
		NULL, assign_syslog_ident, NULL
	},

	{
		{"event_source", PGC_POSTMASTER, LOGGING_WHERE,
			gettext_noop("Sets the application name used to identify "
						 "PostgreSQL messages in the event log."),
			NULL
		},
		&event_source,
		DEFAULT_EVENT_SOURCE,
		NULL, NULL, NULL
	},

	{
		{"TimeZone", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the time zone for displaying and interpreting time stamps."),
			NULL,
			GUC_REPORT
		},
		&timezone_string,
		"GMT",
		check_timezone, assign_timezone, show_timezone
	},
	{
		{"timezone_abbreviations", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Selects a file of time zone abbreviations."),
			NULL
		},
		&timezone_abbreviations_string,
		NULL,
		check_timezone_abbreviations, assign_timezone_abbreviations, NULL
	},

	{
		{"transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the current transaction's isolation level."),
			NULL,
			GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&XactIsoLevel_string,
		"default",
		check_XactIsoLevel, assign_XactIsoLevel, show_XactIsoLevel
	},

	{
		{"unix_socket_group", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the owning group of the Unix-domain socket."),
			gettext_noop("The owning user of the socket is always the user "
						 "that starts the server.")
		},
		&Unix_socket_group,
		"",
		NULL, NULL, NULL
	},

	{
		{"unix_socket_directories", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the directories where Unix-domain sockets will be created."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&Unix_socket_directories,
#ifdef HAVE_UNIX_SOCKETS
		DEFAULT_PGSOCKET_DIR,
#else
		"",
#endif
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
    {
        {"gtm_unix_socket_directory", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
         gettext_noop("Sets the directory where GTM Unix-domain sockets used."),
         NULL,
         GUC_SUPERUSER_ONLY
        },
        &gtm_unix_socket_directory,
#ifdef HAVE_UNIX_SOCKETS
        DEFAULT_PGSOCKET_DIR,
#else
        "",
#endif
        NULL, NULL, NULL
    },
#endif
	{
		{"listen_addresses", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
			gettext_noop("Sets the host name or IP address(es) to listen to."),
			NULL,
			GUC_LIST_INPUT
		},
		&ListenAddresses,
		"localhost",
		NULL, NULL, NULL
	},

	{
		/*
		 * Can't be set by ALTER SYSTEM as it can lead to recursive definition
		 * of data_directory.
		 */
		{"data_directory", PGC_POSTMASTER, FILE_LOCATIONS,
			gettext_noop("Sets the server's data directory."),
			NULL,
			GUC_SUPERUSER_ONLY | GUC_DISALLOW_IN_AUTO_FILE
		},
		&data_directory,
		NULL,
		NULL, NULL, NULL
	},

	{
		{"config_file", PGC_POSTMASTER, FILE_LOCATIONS,
			gettext_noop("Sets the server's main configuration file."),
			NULL,
			GUC_DISALLOW_IN_FILE | GUC_SUPERUSER_ONLY
		},
		&ConfigFileName,
		NULL,
		NULL, NULL, NULL
	},

	{
		{"hba_file", PGC_POSTMASTER, FILE_LOCATIONS,
			gettext_noop("Sets the server's \"hba\" configuration file."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&HbaFileName,
		NULL,
		NULL, NULL, NULL
	},

	{
		{"ident_file", PGC_POSTMASTER, FILE_LOCATIONS,
			gettext_noop("Sets the server's \"ident\" configuration file."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&IdentFileName,
		NULL,
		NULL, NULL, NULL
	},

	{
		{"external_pid_file", PGC_POSTMASTER, FILE_LOCATIONS,
			gettext_noop("Writes the postmaster PID to the specified file."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&external_pid_file,
		NULL,
		check_canonical_path, NULL, NULL
	},

	{
		{"ssl_cert_file", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Location of the SSL server certificate file."),
			NULL
		},
		&ssl_cert_file,
		"server.crt",
		NULL, NULL, NULL
	},

	{
		{"ssl_key_file", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Location of the SSL server private key file."),
			NULL
		},
		&ssl_key_file,
		"server.key",
		NULL, NULL, NULL
	},

	{
		{"ssl_ca_file", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Location of the SSL certificate authority file."),
			NULL
		},
		&ssl_ca_file,
		"",
		NULL, NULL, NULL
	},

	{
		{"ssl_crl_file", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Location of the SSL certificate revocation list file."),
			NULL
		},
		&ssl_crl_file,
		"",
		NULL, NULL, NULL
	},

	{
		{"stats_temp_directory", PGC_SIGHUP, STATS_COLLECTOR,
			gettext_noop("Writes temporary statistics files to the specified directory."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&pgstat_temp_directory,
		PG_STAT_TMP_DIR,
		check_canonical_path, assign_pgstat_temp_directory, NULL
	},

	{
		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_MASTER,
			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
			NULL,
			GUC_LIST_INPUT
		},
		&SyncRepStandbyNames,
		"",
		check_synchronous_standby_names, assign_synchronous_standby_names, NULL
	},

	{
		{"default_text_search_config", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets default text search configuration."),
			NULL
		},
		&TSCurrentConfig,
		"pg_catalog.simple",
		check_TSCurrentConfig, assign_TSCurrentConfig, NULL
	},

#ifdef PGXC
	{
		{"pgxc_node_name", PGC_POSTMASTER, GTM,
			gettext_noop("The Coordinator or Datanode name."),
			NULL,
			GUC_NO_RESET_ALL | GUC_IS_NAME
		},
		&PGXCNodeName,
		"",
		NULL, NULL, NULL
	},
	{
		{"track_context_name", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Memory inflation function monitors the context list, which only takes effect when "
			             "track_memory_mode is set to context. It supports tracking one or more contexts, "
			             "for example, 'CacheMemoryContext, TopMemoryContext'."),
			NULL,
			GUC_IS_NAME
		},
		&track_context_name,
		"ALL",
		NULL, assign_track_context_name, NULL
	},
	{
		{"optimizer_capture_sql_plan_baselines_rules", PGC_USERSET, QUERY_TUNING,
			gettext_noop("SPM capture rules, for example, time=10s. SQL statements that are executed "
			             "more than 5 times and have an execution time of 5 seconds or more will be recorded in the baseline "
			             "if they meet the above-mentioned rules."),
			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE
		},
		&optimizer_capture_sql_plan_baselines_rules,
#ifdef _PG_REGRESS_
		"",
#else
		"time=10s",
#endif
		NULL, assign_spm_plan_capture_rules, NULL
	},
#endif
#ifdef XCP
	{
		{"parentnode", PGC_BACKEND, CONN_AUTH,
			gettext_noop("Sets the name of the parent data node"),
			NULL
		},
		&parentPGXCNode,
		NULL,
		NULL, NULL, NULL
	},
#endif /* XCP */
	{
		{"ssl_ciphers", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Sets the list of allowed SSL ciphers."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&SSLCipherSuites,
#ifdef USE_SSL
		"HIGH:MEDIUM:+3DES:!aNULL",
#else
		"none",
#endif
		NULL, NULL, NULL
	},

	{
		{"ssl_ecdh_curve", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Sets the curve to use for ECDH."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&SSLECDHCurve,
#ifdef USE_SSL
		"prime256v1",
#else
		"none",
#endif
		NULL, NULL, NULL
	},

	{
		{"ssl_dh_params_file", PGC_SIGHUP, CONN_AUTH_SECURITY,
			gettext_noop("Location of the SSL DH params file."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&ssl_dh_params_file,
		"",
		NULL, NULL, NULL
	},

	{
		{"application_name", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("Sets the application name to be reported in statistics and logs."),
			NULL,
			GUC_IS_NAME | GUC_REPORT | GUC_NOT_IN_SAMPLE
		},
		&application_name,
		"",
		check_application_name, assign_application_name, NULL
	},

	{
		{"cluster_name", PGC_POSTMASTER, PROCESS_TITLE,
			gettext_noop("Sets the name of the cluster, which is included in the process title."),
			NULL,
			GUC_IS_NAME
		},
		&cluster_name,
		"",
		check_cluster_name, NULL, NULL
	},

	{
		{"wal_consistency_checking", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Sets the WAL resource managers for which WAL consistency checks are done."),
			gettext_noop("Full-page images will be logged for all data blocks and cross-checked against the results of WAL replay."),
			GUC_LIST_INPUT | GUC_NOT_IN_SAMPLE
		},
		&wal_consistency_checking_string,
		"",
		check_wal_consistency_checking, assign_wal_consistency_checking, NULL
	},

	{
		{"jit_provider", PGC_POSTMASTER, CLIENT_CONN_PRELOAD,
			gettext_noop("JIT provider to use."),
			NULL,
			GUC_SUPERUSER_ONLY
		},
		&jit_provider,
		"llvmjit",
		NULL, NULL, NULL
	},

	{
		{"restrict_nonsystem_relation_kind", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets relation kinds of non-system relation to restrict use"),
			NULL,
			GUC_LIST_INPUT | GUC_NOT_IN_SAMPLE
		},
		&restrict_nonsystem_relation_kind_string,
		"",
		check_restrict_nonsystem_relation_kind, assign_restrict_nonsystem_relation_kind, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"pgbouncer_conf", PGC_POSTMASTER, PROCESS_TITLE,
			gettext_noop("pgbouncer config file name, in PGDATA dir."),
			NULL,
			GUC_IS_NAME
		},
		&g_BouncerConf,
		"pgbouncer.ini",
		NULL, NULL, NULL
	},
#endif
#ifdef __OPENTENBASE__
	{
		{"pooler_unpooled_database", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("databases that pooler will not pool its connections."),
			NULL
		},
		&g_unpooled_database,
		"template1,template0,template1_ora,template0_ora",
		NULL, NULL, NULL
	},
	{
		{"pooler_unpooled_user", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("users that pooler will not pool its connections."),
			NULL
		},
		&g_unpooled_user,
		"mls_admin",
		NULL, NULL, NULL
	},
	{
		{"pool_check_connection_db", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("databases that pool use to check connection."),
			NULL
		},
		&PoolConnectDB,
		"postgres",
		NULL, NULL, NULL
	},
	{
		{"traceid", PGC_INTERNAL, CUSTOM_OPTIONS,
			gettext_noop("show global trace id"),
			NULL
		},
		&GlobalTraceIdHistoryPointer,
		"",
		NULL, NULL, show_global_trace_id	
	},
#endif


	{
		{"nls_sort_locale", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("COLLATE set for nlssort."),
			NULL,
			GUC_REPORT | GUC_NOT_IN_SAMPLE
		},
		&nls_sort_locale,
		NULL,
		NULL, NULL, NULL
	},

#ifdef _MLS_
	{
		{"default_locator_type", PGC_USERSET, LOGGING_WHAT,
			gettext_noop("set default table locator type, enum as shard/hash/replication, default is empty string"),
			NULL,
			GUC_IS_NAME |  GUC_NOT_IN_SAMPLE
		},
		&g_default_locator_type,
		"",
		NULL, assign_default_locator_type, NULL
	},
#endif

#ifdef USE_WHITEBOX_INJECTION
	{
		{"injection_stub_setting", PGC_SUSET, CUSTOM_OPTIONS,
			gettext_noop("Pass settings to transaction whitebox injection framework to set a specified stub."),
			NULL,
			GUC_IS_NAME | GUC_NOT_IN_SAMPLE | GUC_LIST_INPUT
		},
		&injection_stub_setting_placeholder,
		NULL,
		check_whitebox_injection, assign_whitebox_injection, NULL
	},
#endif
#ifndef __OPTIMIZE__
	{
		{"opentenbase_test_flag", PGC_USERSET, CUSTOM_OPTIONS,
			gettext_noop("add/remove opentenbase test flags"),
			NULL,
			GUC_IS_NAME | GUC_NOT_IN_SAMPLE | GUC_LIST_INPUT | GUC_LIST_QUOTE
		},
		&opentenbase_test_flag,
		NULL,
		check_opentenbase_test_flag, assign_opentenbase_test_flag, show_opentenbase_test_flag
	},
#endif

	{
		{"inplace_upgrade_next_system_object_oids", PGC_SUSET, UPGRADE_OPTIONS,
			gettext_noop("Sets oids for the system object to be added next during inplace upgrade."),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_SUPERUSER_ONLY | GUC_LIST_INPUT
		},
		&inplace_upgrade_next_system_object_oids,
		NULL,
		check_inplace_upgrade_next_oids, NULL, NULL
	},

	{
		{"resource_group_name", PGC_POSTMASTER, RESOURCES,
			gettext_noop("resource group name that cgroup can identify, default is opentenbase."),
			NULL,
			GUC_IS_NAME | GUC_NOT_IN_SAMPLE
		},
		&resource_group_name,
		"opentenbase",
		NULL, assign_resource_group_name, NULL
	},

	{
		{"resource_group_bypass_sql", PGC_USERSET, RESOURCES,
			gettext_noop("If set, query matched with the set value will not be limited by resource group."),
			NULL,
			GUC_IS_NAME | GUC_NOT_IN_SAMPLE
		},
		&resource_group_bypass_sql,
		NULL,
		NULL, NULL, NULL
	},

	{
		{"resource_group_leader_coordinator", PGC_SUSET, RESOURCES,
			gettext_noop("If set, query inited from other coordinator should request resource group control on this coordinator."),
			NULL,
			GUC_IS_NAME | GUC_NOT_IN_SAMPLE
		},
		&resource_group_leader_coordinator,
		NULL,
		check_resource_group_leader_coordinator, NULL, NULL
	},

	/* End-of-list marker */
	{
		{NULL, 0, 0, NULL, NULL}, NULL, NULL, NULL, NULL, NULL
	}
};


static struct config_enum ConfigureNamesEnum[] =
{
	{
		{"backslash_quote", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
			gettext_noop("Sets whether \"\\'\" is allowed in string literals."),
			NULL
		},
		&backslash_quote,
		BACKSLASH_QUOTE_SAFE_ENCODING, backslash_quote_options,
		NULL, NULL, NULL
	},

	{
		{"bytea_output", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the output format for bytea."),
			NULL
		},
		&bytea_output,
		BYTEA_OUTPUT_HEX, bytea_output_options,
		NULL, NULL, NULL
	},

	{
		{"client_min_messages", PGC_USERSET, LOGGING_WHEN,
			gettext_noop("Sets the message levels that are sent to the client."),
			gettext_noop("Each level includes all the levels that follow it. The later"
						 " the level, the fewer messages are sent.")
		},
		&client_min_messages,
		NOTICE, client_message_level_options,
		NULL, NULL, NULL
	},

	{
		{"constraint_exclusion", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Enables the planner to use constraints to optimize queries."),
			gettext_noop("Table scans will be skipped if their constraints"
						 " guarantee that no rows match the query."),
			GUC_EXPLAIN
		},
		&constraint_exclusion,
		CONSTRAINT_EXCLUSION_PARTITION, constraint_exclusion_options,
		NULL, NULL, NULL
	},

	{
		{"default_transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the transaction isolation level of each new transaction."),
			NULL
		},
		&DefaultXactIsoLevel,
		XACT_READ_COMMITTED, isolation_level_options,
		NULL, NULL, NULL
	},

	{
		{"IntervalStyle", PGC_USERSET, CLIENT_CONN_LOCALE,
			gettext_noop("Sets the display format for interval values."),
			NULL,
			GUC_REPORT
		},
		&IntervalStyle,
		INTSTYLE_POSTGRES, intervalstyle_options,
		NULL, NULL, NULL
	},

	{
		{"log_error_verbosity", PGC_SUSET, LOGGING_WHAT,
			gettext_noop("Sets the verbosity of logged messages."),
			NULL
		},
		&Log_error_verbosity,
		PGERROR_DEFAULT, log_error_verbosity_options,
		NULL, NULL, NULL
	},
	{
		{"log_min_messages", PGC_SUSET, LOGGING_WHEN,
			gettext_noop("Sets the message levels that are logged."),
			gettext_noop("Each level includes all the levels that follow it. The later"
						 " the level, the fewer messages are sent.")
		},
		&log_min_messages,
		WARNING, server_message_level_options,
		NULL, NULL, NULL
	},

	{
		{"log_min_error_statement", PGC_SUSET, LOGGING_WHEN,
			gettext_noop("Causes all statements generating error at or above this level to be logged."),
			gettext_noop("Each level includes all the levels that follow it. The later"
						 " the level, the fewer messages are sent.")
		},
		&log_min_error_statement,
		ERROR, server_message_level_options,
		NULL, NULL, NULL
	},

	{
		{"log_statement", PGC_SUSET, LOGGING_WHAT,
			gettext_noop("Sets the type of statements logged."),
			NULL
		},
		&log_statement,
		LOGSTMT_NONE, log_statement_options,
		NULL, NULL, NULL
	},

	{
		{"syslog_facility", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the syslog \"facility\" to be used when syslog enabled."),
			NULL
		},
		&syslog_facility,
#ifdef HAVE_SYSLOG
		LOG_LOCAL0,
#else
		0,
#endif
		syslog_facility_options,
		NULL, assign_syslog_facility, NULL
	},

	{
		{"session_replication_role", PGC_SUSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the session's behavior for triggers and rewrite rules."),
			NULL
		},
		&SessionReplicationRole,
		SESSION_REPLICATION_ROLE_ORIGIN, session_replication_role_options,
		NULL, assign_session_replication_role, NULL
	},

	{
		{"synchronous_commit", PGC_USERSET, WAL_SETTINGS,
			gettext_noop("Sets the current transaction's synchronization level."),
			NULL
		},
		&synchronous_commit,
		SYNCHRONOUS_COMMIT_ON, synchronous_commit_options,
		NULL, assign_synchronous_commit, NULL
	},

	{
		{"archive_mode", PGC_POSTMASTER, WAL_ARCHIVING,
			gettext_noop("Allows archiving of WAL files using archive_command."),
			NULL
		},
		&XLogArchiveMode,
		ARCHIVE_MODE_OFF, archive_mode_options,
		NULL, NULL, NULL
	},

	{
		{"trace_recovery_messages", PGC_SIGHUP, DEVELOPER_OPTIONS,
			gettext_noop("Enables logging of recovery-related debugging information."),
			gettext_noop("Each level includes all the levels that follow it. The later"
						 " the level, the fewer messages are sent.")
		},
		&trace_recovery_messages,

		/*
		 * client_message_level_options allows too many values, really, but
		 * it's not worth having a separate options array for this.
		 */
		LOG, client_message_level_options,
		NULL, NULL, NULL
	},

	{
		{"track_functions", PGC_SUSET, STATS_COLLECTOR,
			gettext_noop("Collects function-level statistics on database activity."),
			NULL
		},
		&pgstat_track_functions,
		TRACK_FUNC_OFF, track_function_options,
		NULL, NULL, NULL
	},

	{
		{"wal_level", PGC_POSTMASTER, WAL_SETTINGS,
			gettext_noop("Set the level of information written to the WAL."),
			NULL
		},
		&wal_level,
		WAL_LEVEL_LOGICAL, wal_level_options,
		NULL, NULL, NULL
	},

#ifdef _PG_ORCL_
	{
		{"package_link_method", PGC_USERSET, OPENTENBASE_ORA_COMPAT_OPTIONS,
			gettext_noop("Set the method of a package linked into a function/procedure."),
			gettext_noop("'dynamic' will get more performance but may cause failure when using cursor.")
		},
		&package_link_method,
		PACKAGE_LINK_DEPENDENT, pkg_lk_options,
		NULL, NULL, NULL
	},
#endif

	{
		{"track_memory_mode", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Memory inflation monitoring function switch, which can be set to three values: off/session/context. "
			             "Off, turn off the tracking function; session, support tracking the total memory usage of the context "
			             "at the session level; context, support tracking the memory allocation of specific file:line in the context code."),
			NULL
		},
		&track_memory_mode,
		TRACK_MEM_SESSION,
		track_memory_options,
		NULL, NULL, NULL
	},

	{
		{"optimizer_capture_sql_plan_baselines", PGC_USERSET, QUERY_TUNING,
			gettext_noop("SPM plan capture switch: off - SPM plan capture is not activated, but you can still capture "
			             "and bind plans to the baseline using 'explain (spm apply)'; on - automatic capture based on the "
			             "parameter 'optimizer_capture_sql_plan_baselines_rules'."),
			NULL
		},
		&optimizer_capture_sql_plan_baselines,
#ifdef _PG_REGRESS_
		SPM_CAPTURE_ON,
#else
		SPM_CAPTURE_OFF,
#endif
		optimizer_capture_sql_plan_baselines_options,
		NULL, NULL, NULL
	},
	{
		{"optimizer_use_sql_plan_baselines", PGC_USERSET, QUERY_TUNING,
			gettext_noop("SPM plan effectiveness switch: off - SPM plan is not activated; on - SPM plan is enabled. "
			             "If 'fix' is specified, it will follow the fixed plan by default. Otherwise, it will use the optimizer to generate a plan. "
			             "SPM process will match the plan with the baseline plan, and if any unexpected issues occur, it will trigger an alert."),
			NULL
		},
		&optimizer_use_sql_plan_baselines,
		SPM_APPLY_ON,
		optimizer_use_sql_plan_baselines_options,
		NULL, NULL, NULL
	},

	{
		{"dynamic_shared_memory_type", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Selects the dynamic shared memory implementation used."),
			NULL
		},
		&dynamic_shared_memory_type,
		DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE, dynamic_shared_memory_options,
		NULL, NULL, NULL
	},

	{
		{"wal_sync_method", PGC_SIGHUP, WAL_SETTINGS,
			gettext_noop("Selects the method used for forcing WAL updates to disk."),
			NULL
		},
		&sync_method,
		DEFAULT_SYNC_METHOD, sync_method_options,
		NULL, assign_xlog_sync_method, NULL
	},

	{
		{"xmlbinary", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets how binary values are to be encoded in XML."),
			NULL
		},
		&xmlbinary,
		XMLBINARY_BASE64, xmlbinary_options,
		NULL, NULL, NULL
	},

	{
		{"xmloption", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets whether XML data in implicit parsing and serialization "
						 "operations is to be considered as documents or content fragments."),
			NULL
		},
		&xmloption,
		XMLOPTION_CONTENT, xmloption_options,
		NULL, NULL, NULL
	},
#ifdef PGXC
	{
		{"remotetype", PGC_BACKEND, CONN_AUTH,
			gettext_noop("Sets the type of Postgres-XL remote connection"),
			NULL
		},
		&remoteConnType,
		REMOTE_CONN_APP, pgxc_conn_types,
		NULL, NULL, NULL
	},
#endif
	{
		{"huge_pages", PGC_POSTMASTER, RESOURCES_MEM,
			gettext_noop("Use of huge pages on Linux."),
			NULL
		},
		&huge_pages,
		HUGE_PAGES_TRY, huge_pages_options,
		NULL, NULL, NULL
	},

#ifdef XCP
	{
		{"global_snapshot_source", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Set preferred source of a snapshot."),
			gettext_noop("When set to 'coordinator', a snapshot is taken at "
					"the coordinator at the risk of reduced consistency. "
					"Default is 'gtm'")
		},
		&GlobalSnapshotSource,
		GLOBAL_SNAPSHOT_SOURCE_GTM, global_snapshot_source_options,
		NULL, NULL, NULL
	},
#endif
#ifdef _SHARDING_
	{
		{"shard_visible_mode", PGC_USERSET, SHARD_VISIBLE_MODE,
			gettext_noop("set the mode of shard visibility."),
			NULL
		},
		&g_ShardVisibleMode,
		SHARD_VISIBLE_MODE_VISIBLE, shard_visible_modes,
		NULL, NULL, NULL
	},
#endif
	{
		{"force_parallel_mode", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Forces use of parallel query facilities."),
			gettext_noop("If possible, run query using a parallel worker and with parallel restrictions."),
			GUC_EXPLAIN
		},
		&force_parallel_mode,
		FORCE_PARALLEL_OFF, force_parallel_mode_options,
		NULL, NULL, NULL
	},

	{
		{"password_encryption", PGC_USERSET, CONN_AUTH_SECURITY,
			gettext_noop("Encrypt passwords."),
			gettext_noop("When a password is specified in CREATE USER or "
						 "ALTER USER without writing either ENCRYPTED or UNENCRYPTED, "
						 "this parameter determines whether the password is to be encrypted.")
		},
		&Password_encryption,
		PASSWORD_TYPE_MD5, password_encryption_options,
		NULL, NULL, NULL
	},
#ifdef __OPENTENBASE__
	{
		{"archive_status_control", PGC_USERSET, WAL_ARCHIVING,
			gettext_noop("Control of break or continue archive xlog. "),
			NULL
		},
		&archive_status_control,
		ARCHSTATUS_CONTINUE, archive_status_control_options,
		NULL, NULL, NULL
	},
#ifdef USE_WHITEBOX_INJECTION
	{
		{"injection_stub_default_failure_type", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Global default type of failure for any transaction whitebox stubs."),
			NULL
		},
		&injection_stub_default_failure_type,
		WHITEBOX_INACTIVE, whitebox_injection_failure_type_options,
		NULL, NULL, NULL
	},
	{
		{"injection_stub_default_failure_node", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("Global default node of failure for any transaction whitebox stubs."),
			NULL
		},
		&injection_stub_default_failure_node,
		ALL_NODE, whitebox_injection_failure_node_options,
		NULL, NULL, NULL
	},
#endif
#endif
#ifdef __OPENTENBASE_C__
	{
		{"pgxc_cluster_name", PGC_SIGHUP, GTM,
			gettext_noop("The Cluster name."),
			NULL
		},
		&PGXCPlaneNameID,
		OpenTenBase_Cluster, pgxc_plane_name_control_options,
		NULL, NULL, NULL
	},	
	{
		{"pgxc_main_cluster_name", PGC_POSTMASTER, GTM,
			gettext_noop("The Main Cluster name."),
			NULL
		},
		&PGXCMainPlaneNameID,
		OpenTenBase_Cluster, pgxc_plane_name_control_options,
		NULL, NULL, NULL
	},
	{
		{"default_sql_mode", PGC_USERSET, COMPAT_OPTIONS,
			 gettext_noop("Default sql mode for CREATE DATABASE"),
			 NULL
		},
		&default_sql_mode,
		SQLMODE_POSTGRESQL, default_sql_mode_options,
		NULL, NULL, NULL
	},
	{
		/* Can't be set in postgresql.conf */
		{"sql_mode", PGC_INTERNAL, COMPAT_OPTIONS,
			 gettext_noop("Sets the server (database) sql mode."),
			 NULL,
			 GUC_IS_NAME | GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&sql_mode,
		SQLMODE_POSTGRESQL, default_sql_mode_options,
		NULL, NULL, NULL
	},
	{
	    {"trigger_exec_mode", PGC_USERSET, DEVELOPER_OPTIONS,
	        gettext_noop("Trigger execution mode: pullup, pushdown or auto"),
	        NULL
	    },
	    &g_trig_exec_mode,
	    TRIG_EXECMODE_AUTO, trigger_execmode_options,
	    NULL, NULL, NULL
	},
#endif
	{
		{"advance_verification_action", PGC_USERSET, DEVELOPER_OPTIONS,
			gettext_noop("A common option for detecting uncertain bugs."),
			gettext_noop("Detect uncertain bugs, it will report warning, error, "
						 "panic with stack information when detects any potential serious bugs, "
						 "the stack information is for further analysis of the bug. The default "
						 "action is VERIFY_ACTION_ERROR, Set this option to VERIFY_ACTION_NONE "
						 "to disable report"),
		},
		&advance_verification_action,
		VERIFY_ACTION_ERROR, advance_verification_actions,
		NULL, NULL, NULL
	},

	{
		{"recovery_init_sync_method", PGC_POSTMASTER, ERROR_HANDLING_OPTIONS,
			 gettext_noop("Sets the method for synchronizing the data directory before crash recovery."),
		},
		&recovery_init_sync_method,
		RECOVERY_INIT_SYNC_METHOD_FSYNC, recovery_init_sync_method_options,
		NULL, NULL, NULL
	},

	{
		{"xact_autoanalyze_mode", PGC_USERSET, STATS,
			gettext_noop("autoanalyze mode: dml, use or mix"),
			NULL
		},
		&xact_autoanalyze_mode,
		ANALYZE_AFTER_DML, autoanalyze_option,
		NULL, NULL, NULL
	},

	{
		{"force_assign_xid", PGC_USERSET, STATS,
			gettext_noop("force_assign_xid mode: stop_assign, user_run or dba_freeze"),
			NULL
		},
		&force_assign_xid,
		NOT_ASSIGN_RESERVED_XID, force_assign_xid_option,
		NULL, NULL, NULL
	},

	{
		{"plan_cache_mode", PGC_USERSET, QUERY_TUNING_OTHER,
			gettext_noop("Controls the planner's selection of custom or generic plan."),
			gettext_noop("Prepared statements can have custom and generic plans, and the planner "
						 "will attempt to choose which is better.  This can be set to override "
						 "the default behavior.")
		},
		&plan_cache_mode,
		PLAN_CACHE_MODE_AUTO, plan_cache_mode_options,
		NULL, NULL, NULL
	},

	{
		{"csn_compress_mode", PGC_SIGHUP, CSNLOG_OPTIONS,
			gettext_noop("Deciding whether to delete or compress an unused csnlog file"),
			gettext_noop("in some corner case, we may visit some deleted csnlog files, for ha,"
						 "instead deleting, we compress the compressed csnlog file. ")
		},
		&compress_config,
		REMOVED_WHEN_ERROR, csnlog_compress_option,
		NULL, NULL, NULL
	},

	/* End-of-list marker */
	{
		{NULL, 0, 0, NULL, NULL}, NULL, 0, NULL, NULL, NULL, NULL
	}
};

/******** end of options list ********/


/*
 * To allow continued support of obsolete names for GUC variables, we apply
 * the following mappings to any unrecognized name.  Note that an old name
 * should be mapped to a new one only if the new variable has very similar
 * semantics to the old.
 */
static const char *const map_old_guc_names[] = {
	"sort_mem", "work_mem",
	"vacuum_mem", "maintenance_work_mem",
	NULL
};


/*
 * Actual lookup of variables is done through this single, sorted array.
 */
static struct config_generic **guc_variables;

/* Current number of variables contained in the vector */
static int	num_guc_variables;

/* Current number of variables marked with GUC_EXPLAIN */
static int	num_guc_explain_variables;

/* Vector capacity */
static int	size_guc_variables;


static bool guc_dirty;			/* TRUE if need to do commit/abort work */

static bool reporting_enabled;	/* TRUE to enable GUC_REPORT */

static int	GUCNestLevel = 0;	/* 1 when in main transaction */


static int	guc_var_compare(const void *a, const void *b);
static int	guc_name_compare(const char *namea, const char *nameb);
static void InitializeGUCOptionsFromEnvironment(void);
static void InitializeOneGUCOption(struct config_generic *gconf);
static void push_old_value(struct config_generic *gconf, GucAction action);
static void ReportGUCOption(struct config_generic *record);
static void reapply_stacked_values(struct config_generic *variable,
					   struct config_string *pHolder,
					   GucStack *stack,
					   const char *curvalue,
					   GucContext curscontext, GucSource cursource);
static void ShowGUCConfigOption(const char *name, DestReceiver *dest);
static void ShowAllGUCConfig(DestReceiver *dest);
static char *_ShowOption(struct config_generic *record, bool use_units);
static bool validate_option_array_item(const char *name, const char *value,
						   bool skipIfNoPermissions);
static void write_auto_conf_file(int fd, const char *filename, ConfigVariable *head_p);
static void replace_auto_config_value(ConfigVariable **head_p, ConfigVariable **tail_p,
						  const char *name, const char *value);


/*
 * Some infrastructure for checking malloc/strdup/realloc calls
 */
void *
guc_malloc(int elevel, size_t size)
{
	void	   *data;

	/* Avoid unportable behavior of malloc(0) */
	if (size == 0)
		size = 1;
	data = malloc(size);
	if (data == NULL)
		ereport(elevel,
				(errcode(ERRCODE_OUT_OF_MEMORY),
				 errmsg("out of memory")));
	return data;
}

void *
guc_realloc(int elevel, void *old, size_t size)
{
	void	   *data;

	/* Avoid unportable behavior of realloc(NULL, 0) */
	if (old == NULL && size == 0)
		size = 1;
	data = realloc(old, size);
	if (data == NULL)
		ereport(elevel,
				(errcode(ERRCODE_OUT_OF_MEMORY),
				 errmsg("out of memory")));
	return data;
}

char *
guc_strdup(int elevel, const char *src)
{
	char	   *data;

	data = strdup(src);
	if (data == NULL)
		ereport(elevel,
				(errcode(ERRCODE_OUT_OF_MEMORY),
				 errmsg("out of memory")));
	return data;
}


/*
 * Detect whether strval is referenced anywhere in a GUC string item
 */
static bool
string_field_used(struct config_string *conf, char *strval)
{
	GucStack   *stack;

	if (strval == *(conf->variable) ||
		strval == conf->reset_val ||
		strval == conf->boot_val ||
		strval == conf->prev_reset_val)
		return true;
	for (stack = conf->gen.stack; stack; stack = stack->prev)
	{
		if (strval == stack->prior.val.stringval ||
#ifdef _PG_ORCL_
			strval == stack->new_value.val.stringval ||
#endif
			strval == stack->masked.val.stringval)
			return true;
	}
	return false;
}

/*
 * Support for assigning to a field of a string GUC item.  Free the prior
 * value if it's not referenced anywhere else in the item (including stacked
 * states).
 */
static void
set_string_field(struct config_string *conf, char **field, char *newval)
{
	char	   *oldval = *field;

	/* Do the assignment */
	*field = newval;

	/* Free old value if it's not NULL and isn't referenced anymore */
	if (oldval && !string_field_used(conf, oldval))
		free(oldval);
}

/*
 * Detect whether an "extra" struct is referenced anywhere in a GUC item
 */
static bool
extra_field_used(struct config_generic *gconf, void *extra)
{
	GucStack   *stack;

	if (extra == gconf->extra)
		return true;
	switch (gconf->vartype)
	{
		case PGC_BOOL:
			if (extra == ((struct config_bool *) gconf)->reset_extra ||
					extra == ((struct config_bool *) gconf)->prev_reset_extra)
				return true;
			break;
		case PGC_INT:
			if (extra == ((struct config_int *) gconf)->reset_extra ||
					extra == ((struct config_int *) gconf)->prev_reset_extra)
				return true;
			break;
		case PGC_REAL:
			if (extra == ((struct config_real *) gconf)->reset_extra ||
					extra == ((struct config_real *) gconf)->prev_reset_extra)
				return true;
			break;
		case PGC_STRING:
			if (extra == ((struct config_string *) gconf)->reset_extra ||
					extra == ((struct config_string *) gconf)->prev_reset_extra)
				return true;
			break;
		case PGC_ENUM:
			if (extra == ((struct config_enum *) gconf)->reset_extra ||
					extra == ((struct config_enum *) gconf)->prev_reset_extra)
				return true;
			break;
	}
	for (stack = gconf->stack; stack; stack = stack->prev)
	{
		if (extra == stack->prior.extra ||
#ifdef _PG_ORCL_
			extra == stack->new_value.extra ||
#endif
			extra == stack->masked.extra)
			return true;
	}
	return false;
}

/*
 * Support for assigning to an "extra" field of a GUC item.  Free the prior
 * value if it's not referenced anywhere else in the item (including stacked
 * states).
 */
static void
set_extra_field(struct config_generic *gconf, void **field, void *newval)
{
	void	   *oldval = *field;

	/* Do the assignment */
	*field = newval;

	/* Free old value if it's not NULL and isn't referenced anymore */
	if (oldval && !extra_field_used(gconf, oldval))
		free(oldval);
}


/*
 * Support for copying a variable's active value into a stack entry.
 * The "extra" field associated with the active value is copied, too.
 *
 * NB: be sure stringval and extra fields of a new stack entry are
 * initialized to NULL before this is used, else we'll try to free() them.
 */
static void
set_stack_value(struct config_generic *gconf, config_var_value *val)
{
	switch (gconf->vartype)
	{
		case PGC_BOOL:
			val->val.boolval =
				*((struct config_bool *) gconf)->variable;
			break;
		case PGC_INT:
			val->val.intval =
				*((struct config_int *) gconf)->variable;
			break;
		case PGC_REAL:
			val->val.realval =
				*((struct config_real *) gconf)->variable;
			break;
		case PGC_STRING:
			set_string_field((struct config_string *) gconf,
							 &(val->val.stringval),
							 *((struct config_string *) gconf)->variable);
			break;
		case PGC_ENUM:
			val->val.enumval =
				*((struct config_enum *) gconf)->variable;
			break;
	}
	set_extra_field(gconf, &(val->extra), gconf->extra);
}

/*
 * Support for discarding a no-longer-needed value in a stack entry.
 * The "extra" field associated with the stack entry is cleared, too.
 */
static void
discard_stack_value(struct config_generic *gconf, config_var_value *val)
{
	switch (gconf->vartype)
	{
		case PGC_BOOL:
		case PGC_INT:
		case PGC_REAL:
		case PGC_ENUM:
			/* no need to do anything */
			break;
		case PGC_STRING:
			set_string_field((struct config_string *) gconf,
							 &(val->val.stringval),
							 NULL);
			break;
	}
	set_extra_field(gconf, &(val->extra), NULL);
}


/*
 * Fetch the sorted array pointer (exported for help_config.c's use ONLY)
 */
struct config_generic **
get_guc_variables(void)
{
	return guc_variables;
}


/*
 * Build the sorted array.  This is split out so that it could be
 * re-executed after startup (e.g., we could allow loadable modules to
 * add vars, and then we'd need to re-sort).
 */
void
build_guc_variables(void)
{
	int			size_vars;
	int			num_vars = 0;
	int			num_explain_vars = 0;
	struct config_generic **guc_vars;
	int			i;

	for (i = 0; ConfigureNamesBool[i].gen.name; i++)
	{
		struct config_bool *conf = &ConfigureNamesBool[i];

		/* Rather than requiring vartype to be filled in by hand, do this: */
		conf->gen.vartype = PGC_BOOL;
		num_vars++;

		if (conf->gen.flags & GUC_EXPLAIN)
			num_explain_vars++;
	}

	for (i = 0; ConfigureNamesInt[i].gen.name; i++)
	{
		struct config_int *conf = &ConfigureNamesInt[i];

		conf->gen.vartype = PGC_INT;
		num_vars++;

		if (conf->gen.flags & GUC_EXPLAIN)
			num_explain_vars++;
	}

	for (i = 0; ConfigureNamesReal[i].gen.name; i++)
	{
		struct config_real *conf = &ConfigureNamesReal[i];

		conf->gen.vartype = PGC_REAL;
		num_vars++;

		if (conf->gen.flags & GUC_EXPLAIN)
			num_explain_vars++;
	}

	for (i = 0; ConfigureNamesString[i].gen.name; i++)
	{
		struct config_string *conf = &ConfigureNamesString[i];

		conf->gen.vartype = PGC_STRING;
		num_vars++;

		if (conf->gen.flags & GUC_EXPLAIN)
			num_explain_vars++;
	}

	for (i = 0; ConfigureNamesEnum[i].gen.name; i++)
	{
		struct config_enum *conf = &ConfigureNamesEnum[i];

		conf->gen.vartype = PGC_ENUM;
		num_vars++;

		if (conf->gen.flags & GUC_EXPLAIN)
			num_explain_vars++;
	}

	/*
	 * Create table with 20% slack
	 */
	size_vars = num_vars + num_vars / 4;

	guc_vars = (struct config_generic **)
		guc_malloc(FATAL, size_vars * sizeof(struct config_generic *));

	num_vars = 0;

	for (i = 0; ConfigureNamesBool[i].gen.name; i++)
		guc_vars[num_vars++] = &ConfigureNamesBool[i].gen;

	for (i = 0; ConfigureNamesInt[i].gen.name; i++)
		guc_vars[num_vars++] = &ConfigureNamesInt[i].gen;

	for (i = 0; ConfigureNamesReal[i].gen.name; i++)
		guc_vars[num_vars++] = &ConfigureNamesReal[i].gen;

	for (i = 0; ConfigureNamesString[i].gen.name; i++)
		guc_vars[num_vars++] = &ConfigureNamesString[i].gen;

	for (i = 0; ConfigureNamesEnum[i].gen.name; i++)
		guc_vars[num_vars++] = &ConfigureNamesEnum[i].gen;

	if (guc_variables)
		free(guc_variables);
	guc_variables = guc_vars;
	num_guc_variables = num_vars;
	num_guc_explain_variables = num_explain_vars;
	size_guc_variables = size_vars;
	qsort((void *) guc_variables, num_guc_variables,
		  sizeof(struct config_generic *), guc_var_compare);
}

/*
 * Add a new GUC variable to the list of known variables. The
 * list is expanded if needed.
 */
static bool
add_guc_variable(struct config_generic *var, int elevel)
{
	if (num_guc_variables + 1 >= size_guc_variables)
	{
		/*
		 * Increase the vector by 25%
		 */
		int			size_vars = size_guc_variables + size_guc_variables / 4;
		struct config_generic **guc_vars;

		if (size_vars == 0)
		{
			size_vars = 100;
			guc_vars = (struct config_generic **)
				guc_malloc(elevel, size_vars * sizeof(struct config_generic *));
		}
		else
		{
			guc_vars = (struct config_generic **)
				guc_realloc(elevel, guc_variables, size_vars * sizeof(struct config_generic *));
		}

		if (guc_vars == NULL)
			return false;		/* out of memory */

		guc_variables = guc_vars;
		size_guc_variables = size_vars;
	}
	guc_variables[num_guc_variables++] = var;
	qsort((void *) guc_variables, num_guc_variables,
		  sizeof(struct config_generic *), guc_var_compare);
	return true;
}

/*
 * Create and add a placeholder variable for a custom variable name.
 */
static struct config_generic *
add_placeholder_variable(const char *name, int elevel)
{
	size_t		sz = sizeof(struct config_string) + sizeof(char *);
	struct config_string *var;
	struct config_generic *gen;

	var = (struct config_string *) guc_malloc(elevel, sz);
	if (var == NULL)
		return NULL;
	memset(var, 0, sz);
	gen = &var->gen;

	gen->name = guc_strdup(elevel, name);
	if (gen->name == NULL)
	{
		free(var);
		return NULL;
	}

	gen->context = PGC_USERSET;
	gen->group = CUSTOM_OPTIONS;
	gen->short_desc = "GUC placeholder variable";
	gen->flags = GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_CUSTOM_PLACEHOLDER;
	gen->vartype = PGC_STRING;

	/*
	 * The char* is allocated at the end of the struct since we have no
	 * 'static' place to point to.  Note that the current value, as well as
	 * the boot and reset values, start out NULL.
	 */
	var->variable = (char **) (var + 1);

	if (!add_guc_variable((struct config_generic *) var, elevel))
	{
		free((void *) gen->name);
		free(var);
		return NULL;
	}

	return gen;
}

/*
 * Look up option NAME.  If it exists, return a pointer to its record,
 * else return NULL.  If create_placeholders is TRUE, we'll create a
 * placeholder record for a valid-looking custom variable name.
 */
static struct config_generic *
find_option(const char *name, bool create_placeholders, int elevel)
{
	const char **key = &name;
	struct config_generic **res;
	int			i;

	Assert(name);

	/*
	 * By equating const char ** with struct config_generic *, we are assuming
	 * the name field is first in config_generic.
	 */
	res = (struct config_generic **) bsearch((void *) &key,
											 (void *) guc_variables,
											 num_guc_variables,
											 sizeof(struct config_generic *),
											 guc_var_compare);
	if (res)
		return *res;

	/*
	 * See if the name is an obsolete name for a variable.  We assume that the
	 * set of supported old names is short enough that a brute-force search is
	 * the best way.
	 */
	for (i = 0; map_old_guc_names[i] != NULL; i += 2)
	{
		if (guc_name_compare(name, map_old_guc_names[i]) == 0)
			return find_option(map_old_guc_names[i + 1], false, elevel);
	}

	if (create_placeholders)
	{
		/*
		 * Check if the name is qualified, and if so, add a placeholder.
		 */
		if (strchr(name, GUC_QUALIFIER_SEPARATOR) != NULL)
			return add_placeholder_variable(name, elevel);
	}

	/* Unknown name */
	return NULL;
}


/*
 * comparator for qsorting and bsearching guc_variables array
 */
static int
guc_var_compare(const void *a, const void *b)
{
	const struct config_generic *confa = *(struct config_generic *const *) a;
	const struct config_generic *confb = *(struct config_generic *const *) b;

	if (pg_strcasecmp(confa->name, EXPERIMENT_FEATURE_NAME) == 0 && pg_strcasecmp(confb->name, EXPERIMENT_FEATURE_NAME) == 0)
		return 0;

	if (pg_strcasecmp(confa->name, EXPERIMENT_FEATURE_NAME) == 0)
	{
		return -1;
	}
	if (pg_strcasecmp(confb->name, EXPERIMENT_FEATURE_NAME) == 0)
	{
		return 1;
	}

	return guc_name_compare(confa->name, confb->name);
}

/*
 * the bare comparison function for GUC names
 */
static int
guc_name_compare(const char *namea, const char *nameb)
{
	/*
	 * The temptation to use strcasecmp() here must be resisted, because the
	 * array ordering has to remain stable across setlocale() calls. So, build
	 * our own with a simple ASCII-only downcasing.
	 */
	while (*namea && *nameb)
	{
		char		cha = *namea++;
		char		chb = *nameb++;

		if (cha >= 'A' && cha <= 'Z')
			cha += 'a' - 'A';
		if (chb >= 'A' && chb <= 'Z')
			chb += 'a' - 'A';
		if (cha != chb)
			return cha - chb;
	}
	if (*namea)
		return 1;				/* a is longer */
	if (*nameb)
		return -1;				/* b is longer */
	return 0;
}


/*
 * Initialize GUC options during program startup.
 *
 * Note that we cannot read the config file yet, since we have not yet
 * processed command-line switches.
 */
void
InitializeGUCOptions(void)
{
	int			i;

#ifndef __TDX__
	/*
	 * Before log_line_prefix could possibly receive a nonempty setting, make
	 * sure that timezone processing is minimally alive (see elog.c).
	 */
	pg_timezone_initialize();
#endif

	/*
	 * Build sorted array of all GUC variables.
	 */
	build_guc_variables();

	/*
	 * Load all variables with their compiled-in defaults, and initialize
	 * status fields as needed.
	 */
	for (i = 0; i < num_guc_variables; i++)
	{
		InitializeOneGUCOption(guc_variables[i]);
	}

	guc_dirty = false;

	reporting_enabled = false;

	/*
	 * Prevent any attempt to override the transaction modes from
	 * non-interactive sources.
	 */
	SetConfigOption("transaction_isolation", "default",
					PGC_POSTMASTER, PGC_S_OVERRIDE);
	SetConfigOption("transaction_read_only", "no",
					PGC_POSTMASTER, PGC_S_OVERRIDE);
	SetConfigOption("transaction_deferrable", "no",
					PGC_POSTMASTER, PGC_S_OVERRIDE);
	/*
	 * For historical reasons, some GUC parameters can receive defaults from
	 * environment variables.  Process those settings.
	 */
	InitializeGUCOptionsFromEnvironment();
}

/*
 * Assign any GUC values that can come from the server's environment.
 *
 * This is called from InitializeGUCOptions, and also from ProcessConfigFile
 * to deal with the possibility that a setting has been removed from
 * postgresql.conf and should now get a value from the environment.
 * (The latter is a kludge that should probably go away someday; if so,
 * fold this back into InitializeGUCOptions.)
 */
static void
InitializeGUCOptionsFromEnvironment(void)
{
	char	   *env;
	long		stack_rlimit;

	env = getenv("PGPORT");
	if (env != NULL)
		SetConfigOption("port", env, PGC_POSTMASTER, PGC_S_ENV_VAR);

	env = getenv("PGDATESTYLE");
	if (env != NULL)
		SetConfigOption("datestyle", env, PGC_POSTMASTER, PGC_S_ENV_VAR);

	env = getenv("PGCLIENTENCODING");
	if (env != NULL)
		SetConfigOption("client_encoding", env, PGC_POSTMASTER, PGC_S_ENV_VAR);

	/*
	 * rlimit isn't exactly an "environment variable", but it behaves about
	 * the same.  If we can identify the platform stack depth rlimit, increase
	 * default stack depth setting up to whatever is safe (but at most 2MB).
	 */
	stack_rlimit = get_stack_depth_rlimit();
	if (stack_rlimit > 0)
	{
		long		new_limit = (stack_rlimit - STACK_DEPTH_SLOP) / 1024L;

		if (new_limit > 100)
		{
			char		limbuf[16];

			new_limit = Min(new_limit, 2048);
			sprintf(limbuf, "%ld", new_limit);
			SetConfigOption("max_stack_depth", limbuf,
							PGC_POSTMASTER, PGC_S_ENV_VAR);
		}
	}
}

/*
 * Initialize one GUC option variable to its compiled-in default.
 *
 * Note: the reason for calling check_hooks is not that we think the boot_val
 * might fail, but that the hooks might wish to compute an "extra" struct.
 */
static void
InitializeOneGUCOption(struct config_generic *gconf)
{
	gconf->status = 0;
	gconf->source = PGC_S_DEFAULT;
	gconf->reset_source = PGC_S_DEFAULT;
	gconf->prev_reset_source = PGC_S_DEFAULT;
	gconf->scontext = PGC_INTERNAL;
	gconf->reset_scontext = PGC_INTERNAL;
	gconf->prev_reset_scontext = PGC_INTERNAL;
	gconf->stack = NULL;
	gconf->extra = NULL;
	gconf->sourcefile = NULL;
	gconf->sourceline = 0;

	switch (gconf->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *conf = (struct config_bool *) gconf;
				bool		newval = conf->boot_val;
				void	   *extra = NULL;

				if (!call_bool_check_hook(conf, &newval, &extra,
										  PGC_S_DEFAULT, LOG))
					elog(FATAL, "failed to initialize %s to %d",
						 conf->gen.name, (int) newval);
				if (conf->assign_hook)
					conf->assign_hook(newval, extra);
				*conf->variable = conf->reset_val = conf->prev_reset_val = newval;
				conf->gen.extra = conf->reset_extra = conf->prev_reset_extra = extra;
				break;
			}
		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) gconf;
				int			newval = conf->boot_val;
				void	   *extra = NULL;

				Assert(newval >= conf->min);
				Assert(newval <= conf->max);
				if (!call_int_check_hook(conf, &newval, &extra,
										 PGC_S_DEFAULT, LOG))
					elog(FATAL, "failed to initialize %s to %d",
						 conf->gen.name, newval);
				if (conf->assign_hook)
					conf->assign_hook(newval, extra);
				*conf->variable = conf->reset_val = conf->prev_reset_val = newval;
				conf->gen.extra = conf->reset_extra = conf->prev_reset_extra = extra;
				break;
			}
		case PGC_REAL:
			{
				struct config_real *conf = (struct config_real *) gconf;
				double		newval = conf->boot_val;
				void	   *extra = NULL;

				Assert(newval >= conf->min);
				Assert(newval <= conf->max);
				if (!call_real_check_hook(conf, &newval, &extra,
										  PGC_S_DEFAULT, LOG))
					elog(FATAL, "failed to initialize %s to %g",
						 conf->gen.name, newval);
				if (conf->assign_hook)
					conf->assign_hook(newval, extra);
				*conf->variable = conf->reset_val = conf->prev_reset_val = newval;
				conf->gen.extra = conf->reset_extra = conf->prev_reset_extra = extra;
				break;
			}
		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) gconf;
				char	   *newval;
				void	   *extra = NULL;

				/* non-NULL boot_val must always get strdup'd */
				if (conf->boot_val != NULL)
					newval = guc_strdup(FATAL, conf->boot_val);
				else
					newval = NULL;

				if (!call_string_check_hook(conf, &newval, &extra,
											PGC_S_DEFAULT, LOG))
					elog(FATAL, "failed to initialize %s to \"%s\"",
						 conf->gen.name, newval ? newval : "");
				if (conf->assign_hook)
					conf->assign_hook(newval, extra);
				*conf->variable = conf->reset_val = conf->prev_reset_val = newval;
				conf->gen.extra = conf->reset_extra = conf->prev_reset_extra = extra;
				break;
			}
		case PGC_ENUM:
			{
				struct config_enum *conf = (struct config_enum *) gconf;
				int			newval = conf->boot_val;
				void	   *extra = NULL;

				if (!call_enum_check_hook(conf, &newval, &extra,
										  PGC_S_DEFAULT, LOG))
					elog(FATAL, "failed to initialize %s to %d",
						 conf->gen.name, newval);
				if (conf->assign_hook)
					conf->assign_hook(newval, extra);
				*conf->variable = conf->reset_val = conf->prev_reset_val = newval;
				conf->gen.extra = conf->reset_extra = conf->prev_reset_extra = extra;
				break;
			}
	}
}


/*
 * Select the configuration files and data directory to be used, and
 * do the initial read of postgresql.conf.
 *
 * This is called after processing command-line switches.
 *		userDoption is the -D switch value if any (NULL if unspecified).
 *		progname is just for use in error messages.
 *
 * Returns true on success; on failure, prints a suitable error message
 * to stderr and returns false.
 */
bool
SelectConfigFiles(const char *userDoption, const char *progname)
{
	char	   *configdir;
	char	   *fname;
	struct stat stat_buf;

	/* configdir is -D option, or $PGDATA if no -D */
	if (userDoption)
		configdir = make_absolute_path(userDoption);
	else
		configdir = make_absolute_path(getenv("PGDATA"));

	if (configdir && stat(configdir, &stat_buf) != 0)
	{
		write_stderr("%s: could not access directory \"%s\": %s\n",
					 progname,
					 configdir,
					 strerror(errno));
		if (errno == ENOENT)
			write_stderr("Run initdb or pg_basebackup to initialize a PostgreSQL data directory.\n");
		free(configdir);
		return false;
	}

	/*
	 * Find the configuration file: if config_file was specified on the
	 * command line, use it, else use configdir/postgresql.conf.  In any case
	 * ensure the result is an absolute path, so that it will be interpreted
	 * the same way by future backends.
	 */
	if (ConfigFileName)
		fname = make_absolute_path(ConfigFileName);
	else if (configdir)
	{
		fname = guc_malloc(FATAL,
						   strlen(configdir) + strlen(CONFIG_FILENAME) + 2);
		sprintf(fname, "%s/%s", configdir, CONFIG_FILENAME);
	}
	else
	{
		write_stderr("%s does not know where to find the server configuration file.\n"
					 "You must specify the --config-file or -D invocation "
					 "option or set the PGDATA environment variable.\n",
					 progname);
		return false;
	}

	/*
	 * Set the ConfigFileName GUC variable to its final value, ensuring that
	 * it can't be overridden later.
	 */
	SetConfigOption("config_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
	free(fname);

	/*
	 * Now read the config file for the first time.
	 */
	if (stat(ConfigFileName, &stat_buf) != 0)
	{
		write_stderr("%s: could not access the server configuration file \"%s\": %s\n",
					 progname, ConfigFileName, strerror(errno));
		free(configdir);
		return false;
	}

	/*
	 * Read the configuration file for the first time.  This time only the
	 * data_directory parameter is picked up to determine the data directory,
	 * so that we can read the PG_AUTOCONF_FILENAME file next time.
	 */
	ProcessConfigFile(PGC_POSTMASTER);

	/*
	 * If the data_directory GUC variable has been set, use that as DataDir;
	 * otherwise use configdir if set; else punt.
	 *
	 * Note: SetDataDir will copy and absolute-ize its argument, so we don't
	 * have to.
	 */
	if (data_directory)
		SetDataDir(data_directory);
	else if (configdir)
		SetDataDir(configdir);
	else
	{
		write_stderr("%s does not know where to find the database system data.\n"
					 "This can be specified as \"data_directory\" in \"%s\", "
					 "or by the -D invocation option, or by the "
					 "PGDATA environment variable.\n",
					 progname, ConfigFileName);
		free(configdir);
		return false;
	}

	/*
	 * Reflect the final DataDir value back into the data_directory GUC var.
	 * (If you are wondering why we don't just make them a single variable,
	 * it's because the EXEC_BACKEND case needs DataDir to be transmitted to
	 * child backends specially.  XXX is that still true?  Given that we now
	 * chdir to DataDir, EXEC_BACKEND can read the config file without knowing
	 * DataDir in advance.)
	 */
	SetConfigOption("data_directory", DataDir, PGC_POSTMASTER, PGC_S_OVERRIDE);

	/*
	 * Now read the config file a second time, allowing any settings in the
	 * PG_AUTOCONF_FILENAME file to take effect.  (This is pretty ugly, but
	 * since we have to determine the DataDir before we can find the autoconf
	 * file, the alternatives seem worse.)
	 */
	ProcessConfigFile(PGC_POSTMASTER);

	/*
	 * If timezone_abbreviations wasn't set in the configuration file, install
	 * the default value.  We do it this way because we can't safely install a
	 * "real" value until my_exec_path is set, which may not have happened
	 * when InitializeGUCOptions runs, so the bootstrap default value cannot
	 * be the real desired default.
	 */
	pg_timezone_abbrev_initialize();

	/*
	 * Figure out where pg_hba.conf is, and make sure the path is absolute.
	 */
	if (HbaFileName)
		fname = make_absolute_path(HbaFileName);
	else if (configdir)
	{
		fname = guc_malloc(FATAL,
						   strlen(configdir) + strlen(HBA_FILENAME) + 2);
		sprintf(fname, "%s/%s", configdir, HBA_FILENAME);
	}
	else
	{
		write_stderr("%s does not know where to find the \"hba\" configuration file.\n"
					 "This can be specified as \"hba_file\" in \"%s\", "
					 "or by the -D invocation option, or by the "
					 "PGDATA environment variable.\n",
					 progname, ConfigFileName);
		free(configdir);
		return false;
	}
	SetConfigOption("hba_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
	free(fname);

	/*
	 * Likewise for pg_ident.conf.
	 */
	if (IdentFileName)
		fname = make_absolute_path(IdentFileName);
	else if (configdir)
	{
		fname = guc_malloc(FATAL,
						   strlen(configdir) + strlen(IDENT_FILENAME) + 2);
		sprintf(fname, "%s/%s", configdir, IDENT_FILENAME);
	}
	else
	{
		write_stderr("%s does not know where to find the \"ident\" configuration file.\n"
					 "This can be specified as \"ident_file\" in \"%s\", "
					 "or by the -D invocation option, or by the "
					 "PGDATA environment variable.\n",
					 progname, ConfigFileName);
		return false;
	}
	SetConfigOption("ident_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
	free(fname);

	free(configdir);

	return true;
}


/*
 * Reset all options to their saved default values (implements RESET ALL)
 * parameter 'isDiscard' indicates that this function is called by executing
 * discard all, 'dicard all' directly executed on remote nodes, no need to record
 * the guc changes on local transaction state
 */
void
ResetAllOptions(bool is_setting_backend_resue, bool isDiscard)
{
	int			i;

	if (am_walsender)
	{
		/* never be here */
		ereport(ERROR,
			(errcode(ERRCODE_INTERNAL_ERROR),
				errmsg("RESET ALL is forbidden on wal sender")));
	}

	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *gconf = guc_variables[i];
		bool reinit_reset_val = (is_setting_backend_resue &&
								(gconf->reset_source == PGC_S_DATABASE_USER ||
								 gconf->reset_source == PGC_S_USER));

		/* Don't reset non-SET-able values */
		if (gconf->context != PGC_SUSET &&
			gconf->context != PGC_USERSET)
			continue;
		/* Don't reset if special exclusion from RESET ALL */
		if (gconf->flags & GUC_NO_RESET_ALL)
			continue;

		/*
		 * No need to reset if wasn't SET, if setting backend resue
		 * now, we need to reset the user related configurations
		 */
		if (gconf->source <= PGC_S_OVERRIDE && !reinit_reset_val)
			continue;

		/*if (strcmp(gconf->name, "remotetype") == 0)
			continue;*/

		/* Save old value to support transaction abort */
		push_old_value(gconf, GUC_ACTION_SET);

		switch (gconf->vartype)
		{
			case PGC_BOOL:
				{
					struct config_bool *conf = (struct config_bool *) gconf;

					if (reinit_reset_val)
					{
						conf->reset_val = conf->prev_reset_val;
						set_extra_field(&conf->gen, &conf->reset_extra,
										conf->prev_reset_extra);
						conf->gen.reset_source = conf->gen.prev_reset_source;
						conf->gen.reset_scontext = conf->gen.prev_reset_scontext;
					}

					if (conf->assign_hook)
						conf->assign_hook(conf->reset_val,
											  conf->reset_extra);
					*conf->variable = conf->reset_val;
					set_extra_field(&conf->gen, &conf->gen.extra,
									conf->reset_extra);
					break;
				}
			case PGC_INT:
				{
					struct config_int *conf = (struct config_int *) gconf;

					if (reinit_reset_val)
					{
						conf->reset_val = conf->prev_reset_val;
						set_extra_field(&conf->gen, &conf->reset_extra,
										conf->prev_reset_extra);
						conf->gen.reset_source = conf->gen.prev_reset_source;
						conf->gen.reset_scontext = conf->gen.prev_reset_scontext;
					}

					if (conf->assign_hook)
						conf->assign_hook(conf->reset_val,
											  conf->reset_extra);
					*conf->variable = conf->reset_val;
					set_extra_field(&conf->gen, &conf->gen.extra,
									conf->reset_extra);
					break;
				}
			case PGC_REAL:
				{
					struct config_real *conf = (struct config_real *) gconf;

					if (reinit_reset_val)
					{
						conf->reset_val = conf->prev_reset_val;
						set_extra_field(&conf->gen, &conf->reset_extra,
										conf->prev_reset_extra);
						conf->gen.reset_source = conf->gen.prev_reset_source;
						conf->gen.reset_scontext = conf->gen.prev_reset_scontext;
					}

					if (conf->assign_hook)
						conf->assign_hook(conf->reset_val,
											  conf->reset_extra);
					*conf->variable = conf->reset_val;
					set_extra_field(&conf->gen, &conf->gen.extra,
									conf->reset_extra);
					break;
				}
			case PGC_STRING:
				{
					struct config_string *conf = (struct config_string *) gconf;

					if (reinit_reset_val)
					{
						set_string_field(conf, &conf->reset_val, conf->prev_reset_val);
						set_extra_field(&conf->gen, &conf->reset_extra,
										conf->prev_reset_extra);
						conf->gen.reset_source = conf->gen.prev_reset_source;
						conf->gen.reset_scontext = conf->gen.prev_reset_scontext;
					}

					if (conf->assign_hook)
						conf->assign_hook(conf->reset_val,
											  conf->reset_extra);
					set_string_field(conf, conf->variable, conf->reset_val);
					set_extra_field(&conf->gen, &conf->gen.extra,
									conf->reset_extra);
					break;
				}
			case PGC_ENUM:
				{
					struct config_enum *conf = (struct config_enum *) gconf;

					if (reinit_reset_val)
					{
						conf->reset_val = conf->prev_reset_val;
						set_extra_field(&conf->gen, &conf->reset_extra,
										conf->prev_reset_extra);
						conf->gen.reset_source = conf->gen.prev_reset_source;
						conf->gen.reset_scontext = conf->gen.prev_reset_scontext;
					}

					if (conf->assign_hook)
						conf->assign_hook(conf->reset_val,
											  conf->reset_extra);
					*conf->variable = conf->reset_val;
					set_extra_field(&conf->gen, &conf->gen.extra,
									conf->reset_extra);
					break;
				}
		}

		gconf->source = gconf->reset_source;
		gconf->scontext = gconf->reset_scontext;

		if (gconf->flags & GUC_REPORT)
			ReportGUCOption(gconf);
	}

	++GucSubtxnId;
	if (!isDiscard)
		TransactionResetAllGuc(GucSubtxnId);

	/*
	 * Send accumulated GUC configuration changes to existing connections both
	 * before and during the execution of this RESET command in this transaction
	 */
	if (IS_PGXC_COORDINATOR)
	{
		char *xact_guc_str = GetAllTransactionAndGucString(false);
		if (xact_guc_str)
		{
			SendGucsToExistedConnections(xact_guc_str);
			pfree(xact_guc_str);
		}
	}
}


/*
 * push_old_value
 *		Push previous state during transactional assignment to a GUC variable.
 */
static void
push_old_value(struct config_generic *gconf, GucAction action)
{
	GucStack   *stack;

	/* If we're not inside a nest level, do nothing */
	if (GUCNestLevel == 0)
		return;

	/* Do we already have a stack entry of the current nest level? */
	stack = gconf->stack;
	if (stack && stack->nest_level >= GUCNestLevel)
	{
		/* Yes, so adjust its state if necessary */
		Assert(stack->nest_level == GUCNestLevel);
		switch (action)
		{
			case GUC_ACTION_SET:
				/* SET overrides any prior action at same nest level */
				if (stack->state == GUC_SET_LOCAL)
				{
					/* must discard old masked value */
					discard_stack_value(gconf, &stack->masked);
				}
				stack->state = GUC_SET;
				break;
			case GUC_ACTION_LOCAL:
				if (stack->state == GUC_SET)
				{
					/* SET followed by SET LOCAL, remember SET's value */
					stack->masked_scontext = gconf->scontext;
					set_stack_value(gconf, &stack->masked);
					stack->state = GUC_SET_LOCAL;
				}
				/* in all other cases, no change to stack entry */
				break;
			case GUC_ACTION_SAVE:
				/* Could only have a prior SAVE of same variable */
				Assert(stack->state == GUC_SAVE);
				break;
		}
		Assert(guc_dirty);		/* must be set already */
		return;
	}

	/*
	 * Push a new stack entry
	 *
	 * We keep all the stack entries in TopTransactionContext for simplicity.
	 */
	stack = (GucStack *) MemoryContextAllocZero(TopTransactionContext,
												sizeof(GucStack));

	stack->prev = gconf->stack;
	stack->nest_level = GUCNestLevel;
	switch (action)
	{
		case GUC_ACTION_SET:
			stack->state = GUC_SET;
			break;
		case GUC_ACTION_LOCAL:
			stack->state = GUC_LOCAL;
			break;
		case GUC_ACTION_SAVE:
			stack->state = GUC_SAVE;
			break;
	}
	stack->source = gconf->source;
	stack->scontext = gconf->scontext;
	set_stack_value(gconf, &stack->prior);

	gconf->stack = stack;

	/* Ensure we remember to pop at end of xact */
	guc_dirty = true;
}


/*
 * Do GUC processing at main transaction start.
 */
void
AtStart_GUC(void)
{
	/*
	 * The nest level should be 0 between transactions; if it isn't, somebody
	 * didn't call AtEOXact_GUC, or called it with the wrong nestLevel.  We
	 * throw a warning but make no other effort to clean up.
	 */
	if (GUCNestLevel != 0)
		elog(WARNING, "GUC nest level = %d at transaction start",
			 GUCNestLevel);
	GUCNestLevel = 1;
}

/*
 * Enter a new nesting level for GUC values.  This is called at subtransaction
 * start, and when entering a function that has proconfig settings, and in
 * some other places where we want to set GUC variables transiently.
 * NOTE we must not risk error here, else subtransaction start will be unhappy.
 */
int
NewGUCNestLevel(void)
{
	return ++GUCNestLevel;
}

/*
 * Do GUC processing at transaction or subtransaction commit or abort, or
 * when exiting a function that has proconfig settings, or when undoing a
 * transient assignment to some GUC variables.  (The name is thus a bit of
 * a misnomer; perhaps it should be ExitGUCNestLevel or some such.)
 * During abort, we discard all GUC settings that were applied at nesting
 * levels >= nestLevel.  nestLevel == 1 corresponds to the main transaction.
 */
void
AtEOXact_GUC(bool isCommit, int nestLevel)
{
	bool		still_dirty;
	int			i;

	/*
	 * Note: it's possible to get here with GUCNestLevel == nestLevel-1 during
	 * abort, if there is a failure during transaction start before
	 * AtStart_GUC is called.
	 */
	Assert(nestLevel > 0 &&
		   (nestLevel <= GUCNestLevel ||
			(nestLevel == GUCNestLevel + 1 && !isCommit)));

	/* Quick exit if nothing's changed in this transaction */
	if (!guc_dirty)
	{
		GUCNestLevel = nestLevel - 1;
		return;
	}

	still_dirty = false;
	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *gconf = guc_variables[i];
		GucStack   *stack;

		/*
		 * Process and pop each stack entry within the nest level. To simplify
		 * fmgr_security_definer() and other places that use GUC_ACTION_SAVE,
		 * we allow failure exit from code that uses a local nest level to be
		 * recovered at the surrounding transaction or subtransaction abort;
		 * so there could be more than one stack entry to pop.
		 */
		while ((stack = gconf->stack) != NULL &&
			   stack->nest_level >= nestLevel)
		{
			GucStack   *prev = stack->prev;
			bool		restorePrior = false;
			bool		restoreMasked = false;
			bool		changed;

			/*
			 * In this next bit, if we don't set either restorePrior or
			 * restoreMasked, we must "discard" any unwanted fields of the
			 * stack entries to avoid leaking memory.  If we do set one of
			 * those flags, unused fields will be cleaned up after restoring.
			 */
			if (!isCommit)		/* if abort, always restore prior value */
				restorePrior = true;
			else if (stack->state == GUC_SAVE)
				restorePrior = true;
			else if (stack->nest_level == 1)
			{
				/* transaction commit */
				if (stack->state == GUC_SET_LOCAL)
					restoreMasked = true;
				else if (stack->state == GUC_SET)
				{
					/* we keep the current active value */
					discard_stack_value(gconf, &stack->prior);
				}
				else			/* must be GUC_LOCAL */
					restorePrior = true;
			}
			else if (prev == NULL ||
					 prev->nest_level < stack->nest_level - 1)
			{
				/* decrement entry's level and do not pop it */
				stack->nest_level--;
				continue;
			}
			else
			{
				/*
				 * We have to merge this stack entry into prev. See README for
				 * discussion of this bit.
				 */
				switch (stack->state)
				{
					case GUC_SAVE:
						Assert(false);	/* can't get here */

					case GUC_SET:
						/* next level always becomes SET */
						discard_stack_value(gconf, &stack->prior);
						if (prev->state == GUC_SET_LOCAL)
							discard_stack_value(gconf, &prev->masked);
						prev->state = GUC_SET;
						break;

					case GUC_LOCAL:
						if (prev->state == GUC_SET)
						{
							/* LOCAL migrates down */
							prev->masked_scontext = stack->scontext;
							prev->masked = stack->prior;
							prev->state = GUC_SET_LOCAL;
						}
						else
						{
							/* else just forget this stack level */
							discard_stack_value(gconf, &stack->prior);
						}
						break;

					case GUC_SET_LOCAL:
						/* prior state at this level no longer wanted */
						discard_stack_value(gconf, &stack->prior);
						/* copy down the masked state */
						prev->masked_scontext = stack->masked_scontext;
						if (prev->state == GUC_SET_LOCAL)
							discard_stack_value(gconf, &prev->masked);
						prev->masked = stack->masked;
						prev->state = GUC_SET_LOCAL;
						break;
				}
			}

			changed = false;

			if (restorePrior || restoreMasked)
			{
				/* Perform appropriate restoration of the stacked value */
				config_var_value newvalue;
				GucSource	newsource;
				GucContext	newscontext;

				if (restoreMasked)
				{
					newvalue = stack->masked;
					newsource = PGC_S_SESSION;
					newscontext = stack->masked_scontext;
				}
				else
				{
					newvalue = stack->prior;
					newsource = stack->source;
					newscontext = stack->scontext;
				}

				switch (gconf->vartype)
				{
					case PGC_BOOL:
						{
							struct config_bool *conf = (struct config_bool *) gconf;
							bool		newval = newvalue.val.boolval;
							void	   *newextra = newvalue.extra;

							if (*conf->variable != newval ||
								conf->gen.extra != newextra)
							{
								if (conf->assign_hook)
									conf->assign_hook(newval, newextra);
								*conf->variable = newval;
								set_extra_field(&conf->gen, &conf->gen.extra,
												newextra);
								changed = true;
							}
							break;
						}
					case PGC_INT:
						{
							struct config_int *conf = (struct config_int *) gconf;
							int			newval = newvalue.val.intval;
							void	   *newextra = newvalue.extra;

							if (*conf->variable != newval ||
								conf->gen.extra != newextra)
							{
								if (conf->assign_hook)
									(*conf->assign_hook) (newval, newextra);
								*conf->variable = newval;
								set_extra_field(&conf->gen, &conf->gen.extra,
												newextra);
								changed = true;
							}
							break;
						}
					case PGC_REAL:
						{
							struct config_real *conf = (struct config_real *) gconf;
							double		newval = newvalue.val.realval;
							void	   *newextra = newvalue.extra;

							if (*conf->variable != newval ||
								conf->gen.extra != newextra)
							{
								if (conf->assign_hook)
									conf->assign_hook(newval, newextra);
								*conf->variable = newval;
								set_extra_field(&conf->gen, &conf->gen.extra,
												newextra);
								changed = true;
							}
							break;
						}
					case PGC_STRING:
						{
							struct config_string *conf = (struct config_string *) gconf;
							char	   *newval = newvalue.val.stringval;
							void	   *newextra = newvalue.extra;

							if (*conf->variable != newval ||
								conf->gen.extra != newextra)
							{
								if (conf->assign_hook)
									conf->assign_hook(newval, newextra);
								set_string_field(conf, conf->variable, newval);
								set_extra_field(&conf->gen, &conf->gen.extra,
												newextra);
								changed = true;
							}

							/*
							 * Release stacked values if not used anymore. We
							 * could use discard_stack_value() here, but since
							 * we have type-specific code anyway, might as
							 * well inline it.
							 */
							set_string_field(conf, &stack->prior.val.stringval, NULL);
							set_string_field(conf, &stack->masked.val.stringval, NULL);
							break;
						}
					case PGC_ENUM:
						{
							struct config_enum *conf = (struct config_enum *) gconf;
							int			newval = newvalue.val.enumval;
							void	   *newextra = newvalue.extra;

							if (*conf->variable != newval ||
								conf->gen.extra != newextra)
							{
								if (conf->assign_hook)
									conf->assign_hook(newval, newextra);
								*conf->variable = newval;
								set_extra_field(&conf->gen, &conf->gen.extra,
												newextra);
								changed = true;
							}
							break;
						}
				}

				/*
				 * Release stacked extra values if not used anymore.
				 */
				set_extra_field(gconf, &(stack->prior.extra), NULL);
				set_extra_field(gconf, &(stack->masked.extra), NULL);

				/* And restore source information */
				gconf->source = newsource;
				gconf->scontext = newscontext;
			}


			/* Finish popping the state stack */
			gconf->stack = prev;
			pfree(stack);

			/* Report new value if we changed it */
			if (changed && (gconf->flags & GUC_REPORT))
				ReportGUCOption(gconf);
		}						/* end of stack-popping loop */

		if (stack != NULL)
			still_dirty = true;
	}

	/* If there are no remaining stack entries, we can reset guc_dirty */
	guc_dirty = still_dirty;

	/* Update nesting level */
	GUCNestLevel = nestLevel - 1;
}

void AtEOXact_DisGuc(bool isCommit, int nestLevel)
{
	if (nestLevel == 1)
	{
		if (isCommit)
		{
			MemoryContext oldcontext;

			oldcontext = MemoryContextSwitchTo(TopMemoryContext);
			TopTxnTransferNoneLocalGucList();
			MemoryContextSwitchTo(oldcontext);
		}
		ResetTopTransactionGucList();
	}
	else
	{
		if (isCommit)
		{
			SubTransactionTransferGucListToParent();
		}
		else
		{
			ResetCurrentTransactionGucList();
		}
	}
}


/*
 * Start up automatic reporting of changes to variables marked GUC_REPORT.
 * This is executed at completion of backend startup.
 */
void
BeginReportingGUCOptions(void)
{
	int			i;

	/*
	 * Don't do anything unless talking to an interactive frontend of protocol
	 * 3.0 or later.
	 */
	if (whereToSendOutput != DestRemote ||
		PG_PROTOCOL_MAJOR(FrontendProtocol) < 3)
		return;

	reporting_enabled = true;

	/* Transmit initial values of interesting variables */
	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *conf = guc_variables[i];

		if (conf->flags & GUC_REPORT)
			ReportGUCOption(conf);
	}
}

/*
 * ReportGUCOption: if appropriate, transmit option value to frontend
 */
static void
ReportGUCOption(struct config_generic *record)
{
	if (reporting_enabled && (record->flags & GUC_REPORT))
	{
		char	   *val = _ShowOption(record, false);
		StringInfoData msgbuf;

		if (!IsConnFromCoord())
		{
			pq_beginmessage(&msgbuf, 'S');
			pq_sendstring(&msgbuf, record->name);
			pq_sendstring(&msgbuf, val);
			pq_endmessage(&msgbuf);
		}

		pfree(val);
	}
}

/*
 * Convert a value from one of the human-friendly units ("kB", "min" etc.)
 * to the given base unit.  'value' and 'unit' are the input value and unit
 * to convert from.  The converted value is stored in *base_value.
 *
 * Returns true on success, false if the input unit is not recognized.
 */
static bool
convert_to_base_unit(int64 value, const char *unit,
					 int base_unit, int64 *base_value)
{
	const unit_conversion *table;
	int			i;

	if (base_unit & GUC_UNIT_MEMORY)
		table = memory_unit_conversion_table;
	else
		table = time_unit_conversion_table;

	for (i = 0; *table[i].unit; i++)
	{
		if (base_unit == table[i].base_unit &&
			strcmp(unit, table[i].unit) == 0)
		{
			if (table[i].multiplier < 0)
				*base_value = value / (-table[i].multiplier);
			else
				*base_value = value * table[i].multiplier;
			return true;
		}
	}
	return false;
}

/*
 * Convert a value from one of the human-friendly units ("kB", "min" etc.)
 * to the given base unit.  'value' and 'unit' are the input value and unit
 * to convert from.  The converted value is stored in *base_value.
 *
 * Returns true on success, false if the input unit is not recognized.
 */
static bool
convert_to_base_unit_unsigned(uint64 value, const char *unit,
							  int base_unit, uint64 *base_value)
{
	const unit_conversion *table;
	int			i;

	if (base_unit & GUC_UNIT_MEMORY)
		table = memory_unit_conversion_table;
	else
		table = time_unit_conversion_table;

	for (i = 0; *table[i].unit; i++)
	{
		if (base_unit == table[i].base_unit &&
			strcmp(unit, table[i].unit) == 0)
		{
			if (table[i].multiplier < 0)
				*base_value = value / (-table[i].multiplier);
			else
				*base_value = value * table[i].multiplier;
			return true;
		}
	}
	return false;
}

/*
 * Convert a value in some base unit to a human-friendly unit.  The output
 * unit is chosen so that it's the greatest unit that can represent the value
 * without loss.  For example, if the base unit is GUC_UNIT_KB, 1024 is
 * converted to 1 MB, but 1025 is represented as 1025 kB.
 */
static void
convert_from_base_unit(int64 base_value, int base_unit,
					   int64 *value, const char **unit)
{
	const unit_conversion *table;
	int			i;

	*unit = NULL;

	if (base_unit & GUC_UNIT_MEMORY)
		table = memory_unit_conversion_table;
	else
		table = time_unit_conversion_table;

	for (i = 0; *table[i].unit; i++)
	{
		if (base_unit == table[i].base_unit)
		{
			/*
			 * Accept the first conversion that divides the value evenly. We
			 * assume that the conversions for each base unit are ordered from
			 * greatest unit to the smallest!
			 */
			if (table[i].multiplier < 0)
			{
				*value = base_value * (-table[i].multiplier);
				*unit = table[i].unit;
				break;
			}
			else if (base_value % table[i].multiplier == 0)
			{
				*value = base_value / table[i].multiplier;
				*unit = table[i].unit;
				break;
			}
		}
	}

	Assert(*unit != NULL);
}


/*
 * Try to parse value as an integer.  The accepted formats are the
 * usual decimal, octal, or hexadecimal formats, optionally followed by
 * a unit name if "flags" indicates a unit is allowed.
 *
 * If the string parses okay, return true, else false.
 * If okay and result is not NULL, return the value in *result.
 * If not okay and hintmsg is not NULL, *hintmsg is set to a suitable
 *	HINT message, or NULL if no hint provided.
 */
bool
parse_int(const char *value, int *result, int flags, const char **hintmsg)
{
	int64		val;
	char	   *endptr;

	/* To suppress compiler warnings, always set output params */
	if (result)
		*result = 0;
	if (hintmsg)
		*hintmsg = NULL;

	/* We assume here that int64 is at least as wide as long */
	errno = 0;
	val = strtol(value, &endptr, 0);

	if (endptr == value)
		return false;			/* no HINT for integer syntax error */

	if (errno == ERANGE || val != (int64) ((int32) val))
	{
		if (hintmsg)
			*hintmsg = gettext_noop("Value exceeds integer range.");
		return false;
	}

	/* allow whitespace between integer and unit */
	while (isspace((unsigned char) *endptr))
		endptr++;

	/* Handle possible unit */
	if (*endptr != '\0')
	{
		char		unit[MAX_UNIT_LEN + 1];
		int			unitlen;
		bool		converted = false;

		if ((flags & GUC_UNIT) == 0)
			return false;		/* this setting does not accept a unit */

		unitlen = 0;
		while (*endptr != '\0' && !isspace((unsigned char) *endptr) &&
			   unitlen < MAX_UNIT_LEN)
			unit[unitlen++] = *(endptr++);
		unit[unitlen] = '\0';
		/* allow whitespace after unit */
		while (isspace((unsigned char) *endptr))
			endptr++;

		if (*endptr == '\0')
			converted = convert_to_base_unit(val, unit, (flags & GUC_UNIT),
											 &val);
		if (!converted)
		{
			/* invalid unit, or garbage after the unit; set hint and fail. */
			if (hintmsg)
			{
				if (flags & GUC_UNIT_MEMORY)
					*hintmsg = memory_units_hint;
				else
					*hintmsg = time_units_hint;
			}
			return false;
		}

		/* Check for overflow due to units conversion */
		if (val != (int64) ((int32) val))
		{
			if (hintmsg)
				*hintmsg = gettext_noop("Value exceeds integer range.");
			return false;
		}
	}

	if (result)
		*result = (int) val;
	return true;
}


/*
 * Try to parse value as an unsigned integer.  The accepted formats are the
 * usual decimal, octal, or hexadecimal formats, optionally followed by
 * a unit name if "flags" indicates a unit is allowed.
 *
 * If the string parses okay, return true, else false.
 * If okay and result is not NULL, return the value in *result.
 * If not okay and hintmsg is not NULL, *hintmsg is set to a suitable
 *	HINT message, or NULL if no hint provided.
 */
bool
parse_uint(const char *value, uint *result, int flags, const char **hintmsg)
{
	uint64		val;
	char	   *endptr;

	/* To suppress compiler warnings, always set output params */
	if (result)
		*result = 0;
	if (hintmsg)
		*hintmsg = NULL;

	/* We assume here that int64 is at least as wide as long */
	errno = 0;
	val = strtoul(value, &endptr, 0);

	if (endptr == value)
		return false;			/* no HINT for integer syntax error */

	if (errno == ERANGE || val != (int64) ((int32) val))
	{
		if (hintmsg)
			*hintmsg = gettext_noop("Value exceeds integer range.");
		return false;
	}

	/* allow whitespace between integer and unit */
	while (isspace((unsigned char) *endptr))
		endptr++;

	/* Handle possible unit */
	if (*endptr != '\0')
	{
		char		unit[MAX_UNIT_LEN + 1];
		int			unitlen;
		bool		converted = false;

		if ((flags & GUC_UNIT) == 0)
			return false;		/* this setting does not accept a unit */

		unitlen = 0;
		while (*endptr != '\0' && !isspace((unsigned char) *endptr) &&
			   unitlen < MAX_UNIT_LEN)
			unit[unitlen++] = *(endptr++);
		unit[unitlen] = '\0';
		/* allow whitespace after unit */
		while (isspace((unsigned char) *endptr))
			endptr++;

		if (*endptr == '\0')
			converted = convert_to_base_unit_unsigned(val, unit,
													  (flags & GUC_UNIT),
													  &val);
		if (!converted)
		{
			/* invalid unit, or garbage after the unit; set hint and fail. */
			if (hintmsg)
			{
				if (flags & GUC_UNIT_MEMORY)
					*hintmsg = memory_units_hint;
				else
					*hintmsg = time_units_hint;
			}
			return false;
		}

		/* Check for overflow due to units conversion */
		if (val != (int64) ((int32) val))
		{
			if (hintmsg)
				*hintmsg = gettext_noop("Value exceeds integer range.");
			return false;
		}
	}

	if (result)
		*result = (int) val;
	return true;
}



/*
 * Try to parse value as a floating point number in the usual format.
 * If the string parses okay, return true, else false.
 * If okay and result is not NULL, return the value in *result.
 */
bool
parse_real(const char *value, double *result)
{
	double		val;
	char	   *endptr;

	if (result)
		*result = 0;			/* suppress compiler warning */

	errno = 0;
	val = strtod(value, &endptr);
	if (endptr == value || errno == ERANGE)
		return false;

	/* allow whitespace after number */
	while (isspace((unsigned char) *endptr))
		endptr++;
	if (*endptr != '\0')
		return false;

	if (result)
		*result = val;
	return true;
}


/*
 * Lookup the name for an enum option with the selected value.
 * Should only ever be called with known-valid values, so throws
 * an elog(ERROR) if the enum option is not found.
 *
 * The returned string is a pointer to static data and not
 * allocated for modification.
 */
const char *
config_enum_lookup_by_value(struct config_enum *record, int val)
{
	const struct config_enum_entry *entry;

	for (entry = record->options; entry && entry->name; entry++)
	{
		if (entry->val == val)
			return entry->name;
	}

	elog(ERROR, "could not find enum option %d for %s",
		 val, record->gen.name);
	return NULL;				/* silence compiler */
}


/*
 * Lookup the value for an enum option with the selected name
 * (case-insensitive).
 * If the enum option is found, sets the retval value and returns
 * true. If it's not found, return FALSE and retval is set to 0.
 */
bool
config_enum_lookup_by_name(struct config_enum *record, const char *value,
						   int *retval)
{
	const struct config_enum_entry *entry;

	for (entry = record->options; entry && entry->name; entry++)
	{
		if (pg_strcasecmp(value, entry->name) == 0)
		{
			*retval = entry->val;
			return TRUE;
		}
	}

	*retval = 0;
	return FALSE;
}


/*
 * Return a list of all available options for an enum, excluding
 * hidden ones, separated by the given separator.
 * If prefix is non-NULL, it is added before the first enum value.
 * If suffix is non-NULL, it is added to the end of the string.
 */
static char *
config_enum_get_options(struct config_enum *record, const char *prefix,
						const char *suffix, const char *separator)
{
	const struct config_enum_entry *entry;
	StringInfoData retstr;
	int			seplen;

	initStringInfo(&retstr);
	appendStringInfoString(&retstr, prefix);

	seplen = strlen(separator);
	for (entry = record->options; entry && entry->name; entry++)
	{
		if (!entry->hidden)
		{
			appendStringInfoString(&retstr, entry->name);
			appendBinaryStringInfo(&retstr, separator, seplen);
		}
	}

	/*
	 * All the entries may have been hidden, leaving the string empty if no
	 * prefix was given. This indicates a broken GUC setup, since there is no
	 * use for an enum without any values, so we just check to make sure we
	 * don't write to invalid memory instead of actually trying to do
	 * something smart with it.
	 */
	if (retstr.len >= seplen)
	{
		/* Replace final separator */
		retstr.data[retstr.len - seplen] = '\0';
		retstr.len -= seplen;
	}

	appendStringInfoString(&retstr, suffix);

	return retstr.data;
}

/*
 * Parse and validate a proposed value for the specified configuration
 * parameter.
 *
 * This does built-in checks (such as range limits for an integer parameter)
 * and also calls any check hook the parameter may have.
 *
 * record: GUC variable's info record
 * name: variable name (should match the record of course)
 * value: proposed value, as a string
 * source: identifies source of value (check hooks may need this)
 * elevel: level to log any error reports at
 * newval: on success, converted parameter value is returned here
 * newextra: on success, receives any "extra" data returned by check hook
 *	(caller must initialize *newextra to NULL)
 *
 * Returns true if OK, false if not (or throws error, if elevel >= ERROR)
 */
static bool
parse_and_validate_value(struct config_generic *record,
						 const char *name, const char *value,
						 GucSource source, int elevel,
						 union config_var_val *newval, void **newextra)
{
    bool boot_value = false;

	switch (record->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *conf = (struct config_bool *) record;

				if (!parse_bool(value, &newval->boolval))
				{
					ereport(elevel,
							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
							 errmsg("parameter \"%s\" requires a Boolean value",
									name)));
					return false;
				}

                if (conf->boot_val == newval->boolval)
                    boot_value = true;

				if (!call_bool_check_hook(conf, &newval->boolval, newextra,
										  source, elevel))
					return false;
			}
			break;
		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) record;
				const char *hintmsg;

				if (!parse_int(value, &newval->intval,
							   conf->gen.flags, &hintmsg))
				{
					ereport(elevel,
							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
							 errmsg("invalid value for parameter \"%s\": \"%s\"",
									name, value),
							 hintmsg ? errhint("%s", _(hintmsg)) : 0));
					return false;
				}

                if (conf->boot_val == newval->intval)
                    boot_value = true;

				if (newval->intval < conf->min || newval->intval > conf->max)
				{
					ereport(elevel,
							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
							 errmsg("%d is outside the valid range for parameter \"%s\" (%d .. %d)",
									newval->intval, name,
									conf->min, conf->max)));
					return false;
				}

				if (!call_int_check_hook(conf, &newval->intval, newextra,
										 source, elevel))
					return false;
			}
			break;
		case PGC_REAL:
			{
				struct config_real *conf = (struct config_real *) record;

				if (!parse_real(value, &newval->realval))
				{
					ereport(elevel,
							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
							 errmsg("parameter \"%s\" requires a numeric value",
									name)));
					return false;
				}

                if (conf->boot_val == newval->realval)
                    boot_value = true;

				if (newval->realval < conf->min || newval->realval > conf->max)
				{
					ereport(elevel,
							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
							 errmsg("%g is outside the valid range for parameter \"%s\" (%g .. %g)",
									newval->realval, name,
									conf->min, conf->max)));
					return false;
				}

				if (!call_real_check_hook(conf, &newval->realval, newextra,
										  source, elevel))
					return false;
			}
			break;
		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) record;

				/*
				 * The value passed by the caller could be transient, so we
				 * always strdup it.
				 */
				newval->stringval = guc_strdup(elevel, value);
				if (newval->stringval == NULL)
					return false;

				/*
				 * The only built-in "parsing" check we have is to apply
				 * truncation if GUC_IS_NAME.
				 */
				if (conf->gen.flags & GUC_IS_NAME)
					truncate_identifier(newval->stringval,
										strlen(newval->stringval),
										true);

                if (conf->boot_val)
                {
                    if(pg_strcasecmp(conf->boot_val, newval->stringval) == 0)
                        boot_value = true;
                }
                else if (newval->stringval == NULL)
                {
                    boot_value = true;
                }

                if (!call_string_check_hook(conf, &newval->stringval, newextra,
											source, elevel))
				{
					free(newval->stringval);
					newval->stringval = NULL;
					return false;
				}
			}
			break;
		case PGC_ENUM:
			{
				struct config_enum *conf = (struct config_enum *) record;

				if (!config_enum_lookup_by_name(conf, value, &newval->enumval))
				{
					char	   *hintmsg;

					hintmsg = config_enum_get_options(conf,
													  "Available values: ",
													  ".", ", ");

					ereport(elevel,
							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
							 errmsg("invalid value for parameter \"%s\": \"%s\"",
									name, value),
							 hintmsg ? errhint("%s", _(hintmsg)) : 0));

					if (hintmsg)
						pfree(hintmsg);
					return false;
				}

                if (conf->boot_val == newval->enumval)
                    boot_value = true;

				if (!call_enum_check_hook(conf, &newval->enumval, newextra,
										  source, elevel))
					return false;
			}
			break;
	}

	if (!enable_experiment_isolation && pg_strcasecmp(record->name, "default_transaction_isolation") == 0 && !boot_value)
	{
		ereport(elevel,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("parameter \"%s\" is restricted to default value.", record->name),
				 errhint("enable_experiment_isolation is not restricted but might cause instability.")));
		return false;
	}
	if (!experiment_feature && is_experiment_guc(record) && !boot_value)
	{
		ereport(elevel,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("parameter \"%s\" is restricted to default value.", record->name),
				 errhint("experiment_feature is not restricted but might cause instability.")));
		return true;
	}

	return true;
}

static bool
is_experiment_guc(struct config_generic *record)
{
	if (pg_strcasecmp(record->name, "enable_audit") == 0)
		return true;
	if (pg_strcasecmp(record->name, "enable_audit_warning") == 0)
		return true;
	if (pg_strcasecmp(record->name, "enable_auditlogger_warning") == 0)
		return true;
	if (pg_strcasecmp(record->name, "enable_fga") == 0)
		return true;
	if (pg_strcasecmp(record->name, "enable_data_mask") == 0)
		return true;
	if (pg_strcasecmp(record->name, "snapshot_for_analyze") == 0)
		return true;
    return false;
}

/*
 * should_send_to_nodes
 *
 *   determine whether the GUC option should be sent to remote nodes.
 */
inline static bool
should_send_to_nodes(const char *name,  GucSource source, GucAction action)
{
	/* if not session level or client set */
	if (source != PGC_S_SESSION && source != PGC_S_CLIENT)
		return false;

	/*
	 * GUC_ACTION_SAVE is used for node internal guc changes, such as create
	 * a function with specific guc setting. These will transfer to DN by
	 * utility statement itself, do not send it alone here.
	 */
	if (action == GUC_ACTION_SAVE)
		return false;

	/* do not send thses options to remote */
	if (strcmp(name, "remotetype") == 0)
		return false;

	if (strcmp(name, "parentnode") == 0)
		return false;

	if (strcmp(name, "coordinator_lxid") == 0)
		return false;

	if (strcmp(name, "max_handles_per_node") == 0)
		return false;

	 /* Never send global_session if I'm a remote CN, send my own instead. */
	if (IS_PGXC_REMOTE_COORDINATOR && strcmp(name, "global_session") == 0)
		return false;

	if (IsParallelWorker())
		return false;

	return true;
}


/*
 * Sets option `name' to given value.
 *
 * The value should be a string, which will be parsed and converted to
 * the appropriate data type.  The context and source parameters indicate
 * in which context this function is being called, so that it can apply the
 * access restrictions properly.
 *
 * If value is NULL, set the option to its default value (normally the
 * reset_val, but if source == PGC_S_DEFAULT we instead use the boot_val).
 *
 * action indicates whether to set the value globally in the session, locally
 * to the current top transaction, or just for the duration of a function call.
 *
 * If changeVal is false then don't really set the option but do all
 * the checks to see if it would work.
 *
 * elevel should normally be passed as zero, allowing this function to make
 * its standard choice of ereport level.  However some callers need to be
 * able to override that choice; they should pass the ereport level to use.
 *
 * Return value:
 *	+1: the value is valid and was successfully applied.
 *	0:	the name or value is invalid (but see below).
 *	-1: the value was not applied because of context, priority, or changeVal.
 *
 * If there is an error (non-existing option, invalid value) then an
 * ereport(ERROR) is thrown *unless* this is called for a source for which
 * we don't want an ERROR (currently, those are defaults, the config file,
 * and per-database or per-user settings, as well as callers who specify
 * a less-than-ERROR elevel).  In those cases we write a suitable error
 * message via ereport() and return 0.
 *
 * See also SetConfigOption for an external interface.
 */
int
set_config_option(const char *name, const char *value,
				  GucContext context, GucSource source,
				  GucAction action, bool changeVal, int elevel,
				  bool is_reload)
{
	struct config_generic *record;
	union config_var_val newval_union;
	void	   *newextra = NULL;
	bool		prohibitValueChange = false;
	bool		makeDefault;
#ifdef XCP
	bool		send_to_nodes = false;

	++GucSubtxnId;

	send_to_nodes = should_send_to_nodes(name, source, action);
	
#endif

#ifdef PGXC
	/*
	 * Current GucContest value is needed to check if xc_maintenance_mode parameter
	 * is specified in valid contests.   It is allowed only by SET command or
	 * libpq connect parameters so that setting this ON is just temporary.
	 */
	currentGucContext = context;
#endif

	if (elevel == 0)
	{
		if (source == PGC_S_DEFAULT || source == PGC_S_FILE)
		{
			/*
			 * To avoid cluttering the log, only the postmaster bleats loudly
			 * about problems with the config file.
			 */
			elevel = IsUnderPostmaster ? DEBUG3 : LOG;
		}
		else if (source == PGC_S_GLOBAL ||
				 source == PGC_S_DATABASE ||
				 source == PGC_S_USER ||
				 source == PGC_S_DATABASE_USER)
			elevel = WARNING;
		else
			elevel = ERROR;
	}

	/*
	 * GUC_ACTION_SAVE changes are acceptable during a parallel operation,
	 * because the current worker will also pop the change.  We're probably
	 * dealing with a function having a proconfig entry.  Only the function's
	 * body should observe the change, and peer workers do not share in the
	 * execution of a function call started by this worker.
	 *
	 * Other changes might need to affect other workers, so forbid them.
	 */
	if (IsInParallelMode() && changeVal && action != GUC_ACTION_SAVE)
		ereport(elevel,
				(errcode(ERRCODE_INVALID_TRANSACTION_STATE),
				 errmsg("cannot set parameters during a parallel operation")));

	record = find_option(name, true, elevel);
	if (record == NULL)
	{
		ereport(elevel,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
				 errmsg("unrecognized configuration parameter \"%s\"", name)));
		return 0;
	}

	if (!ORA_MODE && record->group == OPENTENBASE_ORA_COMPAT_OPTIONS)
		elog(NOTICE, "The parameter \"%s\" should use in opentenbase_ora mode.", name);

	/*
	 * Check if the option can be set at this time. See guc.h for the precise
	 * rules.
	 */
	switch (record->context)
	{
		case PGC_INTERNAL:
			if (context != PGC_INTERNAL)
			{
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
						 errmsg("parameter \"%s\" cannot be changed",
								name)));
				return 0;
			}
			break;
		case PGC_POSTMASTER:
			if (context == PGC_SIGHUP)
			{
				/*
				 * We are re-reading a PGC_POSTMASTER variable from
				 * postgresql.conf.  We can't change the setting, so we should
				 * give a warning if the DBA tries to change it.  However,
				 * because of variant formats, canonicalization by check
				 * hooks, etc, we can't just compare the given string directly
				 * to what's stored.  Set a flag to check below after we have
				 * the final storable value.
				 */
				prohibitValueChange = true;
			}
			else if (context != PGC_POSTMASTER)
			{
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
						 errmsg("parameter \"%s\" cannot be changed without restarting the server",
								name)));
				return 0;
			}
			break;
		case PGC_SIGHUP:
			if (context != PGC_SIGHUP && context != PGC_POSTMASTER)
			{
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
						 errmsg("parameter \"%s\" cannot be changed now",
								name)));
				return 0;
			}

			/*
			 * Hmm, the idea of the SIGHUP context is "ought to be global, but
			 * can be changed after postmaster start". But there's nothing
			 * that prevents a crafty administrator from sending SIGHUP
			 * signals to individual backends only.
			 */
			break;
		case PGC_SU_BACKEND:
			/* Reject if we're connecting but user is not superuser */
			if (context == PGC_BACKEND)
			{
				ereport(elevel,
						(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
						 errmsg("permission denied to set parameter \"%s\"",
								name)));
				return 0;
			}
			/* FALL THRU to process the same as PGC_BACKEND */
		case PGC_BACKEND:
			if (context == PGC_SIGHUP)
			{
				/*
				 * If a PGC_BACKEND or PGC_SU_BACKEND parameter is changed in
				 * the config file, we want to accept the new value in the
				 * postmaster (whence it will propagate to
				 * subsequently-started backends), but ignore it in existing
				 * backends.  This is a tad klugy, but necessary because we
				 * don't re-read the config file during backend start.
				 *
				 * In EXEC_BACKEND builds, this works differently: we load all
				 * non-default settings from the CONFIG_EXEC_PARAMS file
				 * during backend start.  In that case we must accept
				 * PGC_SIGHUP settings, so as to have the same value as if
				 * we'd forked from the postmaster.  This can also happen when
				 * using RestoreGUCState() within a background worker that
				 * needs to have the same settings as the user backend that
				 * started it. is_reload will be true when either situation
				 * applies.
				 */
				if (IsUnderPostmaster && !is_reload)
					return -1;
			}
			else if (context != PGC_POSTMASTER &&
					 context != PGC_BACKEND &&
					 context != PGC_SU_BACKEND &&
					 source != PGC_S_CLIENT)
			{
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
						 errmsg("parameter \"%s\" cannot be set after connection start",
								name)));
				return 0;
			}
			break;
		case PGC_SUSET:
			if (context == PGC_USERSET || context == PGC_BACKEND)
			{
				ereport(elevel,
						(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
						 errmsg("permission denied to set parameter \"%s\"",
								name)));
				return 0;
			}
			break;
		case PGC_USERSET:
			/* always okay */
			break;
	}

	/*
	 * Disallow changing GUC_NOT_WHILE_SEC_REST values if we are inside a
	 * security restriction context.  We can reject this regardless of the GUC
	 * context or source, mainly because sources that it might be reasonable
	 * to override for won't be seen while inside a function.
	 *
	 * Note: variables marked GUC_NOT_WHILE_SEC_REST should usually be marked
	 * GUC_NO_RESET_ALL as well, because ResetAllOptions() doesn't check this.
	 * An exception might be made if the reset value is assumed to be "safe".
	 *
	 * Note: this flag is currently used for "session_authorization" and
	 * "role".  We need to prohibit changing these inside a local userid
	 * context because when we exit it, GUC won't be notified, leaving things
	 * out of sync.  (This could be fixed by forcing a new GUC nesting level,
	 * but that would change behavior in possibly-undesirable ways.)  Also, we
	 * prohibit changing these in a security-restricted operation because
	 * otherwise RESET could be used to regain the session user's privileges.
	 */
	if (record->flags & GUC_NOT_WHILE_SEC_REST)
	{
		if (InLocalUserIdChange())
		{
			/*
			 * Phrasing of this error message is historical, but it's the most
			 * common case.
			 */
			ereport(elevel,
					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
					 errmsg("cannot set parameter \"%s\" within security-definer function",
							name)));
			return 0;
		}
		if (InSecurityRestrictedOperation())
		{
			ereport(elevel,
					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
					 errmsg("cannot set parameter \"%s\" within security-restricted operation",
							name)));
			return 0;
		}
	}

	/*
	 * Should we set reset/stacked values?	(If so, the behavior is not
	 * transactional.)	This is done either when we get a default value from
	 * the database's/user's/client's default settings or when we reset a
	 * value to its default.
	 */
	makeDefault = changeVal && (source <= PGC_S_OVERRIDE) &&
		((value != NULL) || source == PGC_S_DEFAULT);

	/*
	 * Ignore attempted set if overridden by previously processed setting.
	 * However, if changeVal is false then plow ahead anyway since we are
	 * trying to find out if the value is potentially good, not actually use
	 * it. Also keep going if makeDefault is true, since we may want to set
	 * the reset/stacked values even if we can't set the variable itself.
	 */
	if (record->source > source)
	{
		if (changeVal && !makeDefault)
		{
			elog(DEBUG3, "\"%s\": setting ignored because previous source is higher priority",
				 name);
			return -1;
		}
		changeVal = false;
	}

	/*
	 * Evaluate value and set variable.
	 */
	switch (record->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *conf = (struct config_bool *) record;

#define newval (newval_union.boolval)

				if (value)
				{
					if (!parse_and_validate_value(record, name, value,
												  source, elevel,
												  &newval_union, &newextra))
						return 0;
				}
				else if (source == PGC_S_DEFAULT)
				{
					newval = conf->boot_val;
					if (!call_bool_check_hook(conf, &newval, &newextra,
											  source, elevel))
						return 0;
				}
				else
				{
					newval = conf->reset_val;
					newextra = conf->reset_extra;
					source = conf->gen.reset_source;
					context = conf->gen.reset_scontext;
				}

				if (prohibitValueChange)
				{
					if (*conf->variable != newval)
					{
						record->status |= GUC_PENDING_RESTART;
						ereport(elevel,
								(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
								 errmsg("parameter \"%s\" cannot be changed without restarting the server",
										name)));
						return 0;
					}
					record->status &= ~GUC_PENDING_RESTART;
					return -1;
				}

				if (changeVal)
				{
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen, action);

					if (conf->assign_hook)
						(*conf->assign_hook) (newval, newextra);
					*conf->variable = newval;
					set_extra_field(&conf->gen, &conf->gen.extra,
									newextra);
					conf->gen.source = source;
					conf->gen.scontext = context;
				}
				if (makeDefault)
				{
					GucStack   *stack;

					if (conf->gen.reset_source <= source)
					{
						/* save the context of the previous reset If it is user related */
						if (source == PGC_S_USER || source == PGC_S_DATABASE_USER)
						{
							conf->prev_reset_val = conf->reset_val;
							set_extra_field(&conf->gen, &conf->prev_reset_extra,
											conf->reset_extra);
							conf->gen.prev_reset_source = conf->gen.reset_source;
							conf->gen.prev_reset_scontext = conf->gen.reset_scontext;
						}

						conf->reset_val = newval;
						set_extra_field(&conf->gen, &conf->reset_extra,
										newextra);
						conf->gen.reset_source = source;
						conf->gen.reset_scontext = context;
					}
					for (stack = conf->gen.stack; stack; stack = stack->prev)
					{
						if (stack->source <= source)
						{
							stack->prior.val.boolval = newval;
							set_extra_field(&conf->gen, &stack->prior.extra,
											newextra);
							stack->source = source;
							stack->scontext = context;
						}
					}
				}

				/* Perhaps we didn't install newextra anywhere */
				if (newextra && !extra_field_used(&conf->gen, newextra))
					free(newextra);
				break;

#undef newval
			}

		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) record;

#define newval (newval_union.intval)

				if (value)
				{
					if (!parse_and_validate_value(record, name, value,
												  source, elevel,
												  &newval_union, &newextra))
						return 0;
				}
				else if (source == PGC_S_DEFAULT)
				{
					newval = conf->boot_val;
					if (!call_int_check_hook(conf, &newval, &newextra,
											 source, elevel))
						return 0;
				}
				else
				{
					newval = conf->reset_val;
					newextra = conf->reset_extra;
					source = conf->gen.reset_source;
					context = conf->gen.reset_scontext;
				}

				if (prohibitValueChange)
				{
					if (*conf->variable != newval)
					{
						record->status |= GUC_PENDING_RESTART;
						ereport(elevel,
								(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
								 errmsg("parameter \"%s\" cannot be changed without restarting the server",
										name)));
						return 0;
					}
					record->status &= ~GUC_PENDING_RESTART;
					return -1;
				}

				if (changeVal)
				{
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen, action);

					if (conf->assign_hook)
						conf->assign_hook(newval, newextra);
					*conf->variable = newval;
					set_extra_field(&conf->gen, &conf->gen.extra,
									newextra);
					conf->gen.source = source;
					conf->gen.scontext = context;
				}
				if (makeDefault)
				{
					GucStack   *stack;

					if (conf->gen.reset_source <= source)
					{
						/* save the context of the previous reset If it is user related */
						if (source == PGC_S_USER || source == PGC_S_DATABASE_USER)
						{
							conf->prev_reset_val = conf->reset_val;
							set_extra_field(&conf->gen, &conf->prev_reset_extra,
											conf->reset_extra);
							conf->gen.prev_reset_source = conf->gen.reset_source;
							conf->gen.prev_reset_scontext = conf->gen.reset_scontext;
						}

						conf->reset_val = newval;
						set_extra_field(&conf->gen, &conf->reset_extra,
										newextra);
						conf->gen.reset_source = source;
						conf->gen.reset_scontext = context;
					}
					for (stack = conf->gen.stack; stack; stack = stack->prev)
					{
						if (stack->source <= source)
						{
							stack->prior.val.intval = newval;
							set_extra_field(&conf->gen, &stack->prior.extra,
											newextra);
							stack->source = source;
							stack->scontext = context;
						}
					}
				}

				/* Perhaps we didn't install newextra anywhere */
				if (newextra && !extra_field_used(&conf->gen, newextra))
					free(newextra);
				break;

#undef newval
			}

		case PGC_REAL:
			{
				struct config_real *conf = (struct config_real *) record;

#define newval (newval_union.realval)

				if (value)
				{
					if (!parse_and_validate_value(record, name, value,
												  source, elevel,
												  &newval_union, &newextra))
						return 0;
				}
				else if (source == PGC_S_DEFAULT)
				{
					newval = conf->boot_val;
					if (!call_real_check_hook(conf, &newval, &newextra,
											  source, elevel))
						return 0;
				}
				else
				{
					newval = conf->reset_val;
					newextra = conf->reset_extra;
					source = conf->gen.reset_source;
					context = conf->gen.reset_scontext;
				}

				if (prohibitValueChange)
				{
					if (*conf->variable != newval)
					{
						record->status |= GUC_PENDING_RESTART;
						ereport(elevel,
								(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
								 errmsg("parameter \"%s\" cannot be changed without restarting the server",
										name)));
						return 0;
					}
					record->status &= ~GUC_PENDING_RESTART;
					return -1;
				}

				if (changeVal)
				{
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen, action);

					if (conf->assign_hook)
						conf->assign_hook(newval, newextra);
					*conf->variable = newval;
					set_extra_field(&conf->gen, &conf->gen.extra,
									newextra);
					conf->gen.source = source;
					conf->gen.scontext = context;
				}
				if (makeDefault)
				{
					GucStack   *stack;

					if (conf->gen.reset_source <= source)
					{
						/* save the context of the previous reset If it is user related */
						if (source == PGC_S_USER || source == PGC_S_DATABASE_USER)
						{
							conf->prev_reset_val = conf->reset_val;
							set_extra_field(&conf->gen, &conf->prev_reset_extra,
											conf->reset_extra);
							conf->gen.prev_reset_source = conf->gen.reset_source;
							conf->gen.prev_reset_scontext = conf->gen.reset_scontext;
						}

						conf->reset_val = newval;
						set_extra_field(&conf->gen, &conf->reset_extra,
										newextra);
						conf->gen.reset_source = source;
						conf->gen.reset_scontext = context;
					}
					for (stack = conf->gen.stack; stack; stack = stack->prev)
					{
						if (stack->source <= source)
						{
							stack->prior.val.realval = newval;
							set_extra_field(&conf->gen, &stack->prior.extra,
											newextra);
							stack->source = source;
							stack->scontext = context;
						}
					}
				}

				/* Perhaps we didn't install newextra anywhere */
				if (newextra && !extra_field_used(&conf->gen, newextra))
					free(newextra);
				break;

#undef newval
			}

		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) record;
				GucContext	orig_context = context;
				GucSource	orig_source = source;

#define newval (newval_union.stringval)

				if (value)
				{
					if (!parse_and_validate_value(record, name, value,
												  source, elevel,
												  &newval_union, &newextra))
						return 0;
				}
				else if (source == PGC_S_DEFAULT)
				{
					/* non-NULL boot_val must always get strdup'd */
					if (conf->boot_val != NULL)
					{
						newval = guc_strdup(elevel, conf->boot_val);
						if (newval == NULL)
							return 0;
					}
					else
						newval = NULL;

					if (!call_string_check_hook(conf, &newval, &newextra,
												source, elevel))
					{
						free(newval);
						return 0;
					}
				}
				else
				{
					/*
					 * strdup not needed, since reset_val is already under
					 * guc.c's control
					 */
					newval = conf->reset_val;
					newextra = conf->reset_extra;
					source = conf->gen.reset_source;
					context = conf->gen.reset_scontext;
				}

				if (prohibitValueChange)
				{
					/* newval shouldn't be NULL, so we're a bit sloppy here */
					if (*conf->variable == NULL || newval == NULL ||
						strcmp(*conf->variable, newval) != 0)
					{
						record->status |= GUC_PENDING_RESTART;
						ereport(elevel,
								(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
								 errmsg("parameter \"%s\" cannot be changed without restarting the server",
										name)));
						return 0;
					}
					record->status &= ~GUC_PENDING_RESTART;
					return -1;
				}

				if (changeVal)
				{
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen, action);

					if (conf->assign_hook)
						conf->assign_hook(newval, newextra);
					set_string_field(conf, conf->variable, newval);
					set_extra_field(&conf->gen, &conf->gen.extra,
									newextra);
					conf->gen.source = source;
					conf->gen.scontext = context;

					/*
					 * Ugly hack: during SET session_authorization, forcibly
					 * do SET ROLE NONE with the same context/source/etc, so
					 * that the effects will have identical lifespan.  This is
					 * required by the SQL spec, and it's not possible to do
					 * it within the variable's check hook or assign hook
					 * because our APIs for those don't pass enough info.
					 * However, don't do it if is_reload: in that case we
					 * expect that if "role" isn't supposed to be default, it
					 * has been or will be set by a separate reload action.
					 *
					 * Also, for the call from InitializeSessionUserId with
					 * source == PGC_S_OVERRIDE, use PGC_S_DYNAMIC_DEFAULT for
					 * "role"'s source, so that it's still possible to set
					 * "role" from pg_db_role_setting entries.  (See notes in
					 * InitializeSessionUserId before changing this.)
					 *
					 * A fine point: for RESET session_authorization, we do
					 * "RESET role" not "SET ROLE NONE" (by passing down NULL
					 * rather than "none" for the value).  This would have the
					 * same effects in typical cases, but if the reset value
					 * of "role" is not "none" it seems better to revert to
					 * that.
					 */
					if (!is_reload &&
						strcmp(conf->gen.name, "session_authorization") == 0)
						(void) set_config_option("role",
												 value ? "none" : NULL,
												 orig_context,
												 (orig_source == PGC_S_OVERRIDE)
												 ? PGC_S_DYNAMIC_DEFAULT
												 : orig_source,
												 action,
												 true,
												 elevel,
												 false);
				}

				if (makeDefault)
				{
					GucStack   *stack;

					if (conf->gen.reset_source <= source)
					{
						/* save the context of the previous reset If it is user related */
						if (source == PGC_S_USER || source == PGC_S_DATABASE_USER)
						{
							set_string_field(conf, &conf->prev_reset_val, conf->reset_val);
							set_extra_field(&conf->gen, &conf->prev_reset_extra,
											conf->reset_extra);
							conf->gen.prev_reset_source = conf->gen.reset_source;
							conf->gen.prev_reset_scontext = conf->gen.reset_scontext;
						}

						set_string_field(conf, &conf->reset_val, newval);
						set_extra_field(&conf->gen, &conf->reset_extra,
										newextra);
						conf->gen.reset_source = source;
						conf->gen.reset_scontext = context;
					}
					for (stack = conf->gen.stack; stack; stack = stack->prev)
					{
						if (stack->source <= source)
						{
							set_string_field(conf, &stack->prior.val.stringval,
											 newval);
							set_extra_field(&conf->gen, &stack->prior.extra,
											newextra);
							stack->source = source;
							stack->scontext = context;
						}
					}
				}

				/* Perhaps we didn't install newval anywhere */
				if (newval && !string_field_used(conf, newval))
					free(newval);
				/* Perhaps we didn't install newextra anywhere */
				if (newextra && !extra_field_used(&conf->gen, newextra))
					free(newextra);
				break;

#undef newval
			}

		case PGC_ENUM:
			{
				struct config_enum *conf = (struct config_enum *) record;

#define newval (newval_union.enumval)

				if (value)
				{
					if (!parse_and_validate_value(record, name, value,
												  source, elevel,
												  &newval_union, &newextra))
						return 0;
				}
				else if (source == PGC_S_DEFAULT)
				{
					newval = conf->boot_val;
					if (!call_enum_check_hook(conf, &newval, &newextra,
											  source, elevel))
						return 0;
				}
				else
				{
					newval = conf->reset_val;
					newextra = conf->reset_extra;
					source = conf->gen.reset_source;
					context = conf->gen.reset_scontext;
				}

				if (prohibitValueChange)
				{
					if (*conf->variable != newval)
					{
						record->status |= GUC_PENDING_RESTART;
						ereport(elevel,
								(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
								 errmsg("parameter \"%s\" cannot be changed without restarting the server",
										name)));
						return 0;
					}
					record->status &= ~GUC_PENDING_RESTART;
					return -1;
				}

				if (changeVal)
				{
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen, action);

					if (conf->assign_hook)
						conf->assign_hook(newval, newextra);
					*conf->variable = newval;
					set_extra_field(&conf->gen, &conf->gen.extra,
									newextra);
					conf->gen.source = source;
					conf->gen.scontext = context;
				}
				if (makeDefault)
				{
					GucStack   *stack;

					if (conf->gen.reset_source <= source)
					{
						/* save the context of the previous reset If it is user related */
						if (source == PGC_S_USER || source == PGC_S_DATABASE_USER)
						{
							conf->prev_reset_val = conf->reset_val;
							set_extra_field(&conf->gen, &conf->prev_reset_extra,
											conf->reset_extra);
							conf->gen.prev_reset_source = conf->gen.reset_source;
							conf->gen.prev_reset_scontext = conf->gen.reset_scontext;
						}

						conf->reset_val = newval;
						set_extra_field(&conf->gen, &conf->reset_extra,
										newextra);
						conf->gen.reset_source = source;
						conf->gen.reset_scontext = context;
					}
					for (stack = conf->gen.stack; stack; stack = stack->prev)
					{
						if (stack->source <= source)
						{
							stack->prior.val.enumval = newval;
							set_extra_field(&conf->gen, &stack->prior.extra,
											newextra);
							stack->source = source;
							stack->scontext = context;
						}
					}
				}

				/* Perhaps we didn't install newextra anywhere */
				if (newextra && !extra_field_used(&conf->gen, newextra))
					free(newextra);
				break;

#undef newval
			}
	}

	if (changeVal && (record->flags & GUC_REPORT))
		ReportGUCOption(record);

#ifdef XCP
	if (send_to_nodes)
	{
		RemoteQuery    *step;
		StringInfoData 	poolcmd;
        bool            has_param = false;

		initStringInfo(&poolcmd);
		/*
		 * Save new parameter value with the node manager.
		 * XXX here we may check: if value equals to configuration default
		 * just reset parameter instead. Minus one table entry, shorter SET
		 * command sent down... Sounds like optimization.
		 */

		if (action == GUC_ACTION_LOCAL)
		{
            has_param = session_param_list_has_param(true, name, value, record->flags);
            
            if (enable_skip_send_read_commited)
            {
                if (strstr(name, "isolation") && value && strstr(value, "read committed"))
                    has_param = true;
            }

			TransactionSetGuc(true, name, value, record->flags, GucSubtxnId);

			value = quote_guc_value(name, value, record->flags);
			appendStringInfo(&poolcmd, "SET LOCAL %s TO %s", name,
					(value ? value : "DEFAULT"));
		}
		else
		{
            has_param = session_param_list_has_param(false, name, value, record->flags);

			if (IsTransactionBlock() || IsSubTransaction())
				TransactionSetGuc(false, name, value, record->flags, GucSubtxnId);
			else
				session_param_list_set(false, name, value, record->flags, GucSubtxnId);


			value = quote_guc_value(name, value, record->flags);
			appendStringInfo(&poolcmd, "SET %s TO %s", name,
					(value ? value : "DEFAULT"));
		}
		/*
		 * Send new value down to remote nodes if any is connected
		 * XXX here we are creatig a node and invoke a function that is trying
		 * to send some. That introduces some overhead, which may seem to be
		 * significant if application sets a bunch of parameters before doing
		 * anything useful - waste work for for each set statement.
		 * We may want to avoid that, by resetting the remote parameters and
		 * flagging that parameters needs to be updated before sending down next
		 * statement.
		 * On the other hand if session runs with a number of customized
		 * parameters and switching one, that would cause all values are resent.
		 * So let's go with "send immediately" approach: parameters are not set
		 * too often to care about overhead here.
		 */
        if (!has_param && IS_PGXC_COORDINATOR)
        {
            step = makeNode(RemoteQuery);
            step->combine_type = COMBINE_TYPE_SAME;
            step->exec_nodes = NULL;
            step->sql_statement = poolcmd.data;
            /* force_autocommit is actually does not start transaction on nodes */
            step->force_autocommit = true;

			if (!(IsTransactionBlock() || IsSubTransaction()))
			{
				step->exec_type = EXEC_ON_CURRENT;
				step->is_set = true;
				ExecRemoteUtility(step);
				pfree(step);
			}
        }
		pfree(poolcmd.data);
	}
#endif


#if 0
#ifdef XCP
	if (send_to_nodes)
	{
#if 0
		RemoteQuery    *step;
		StringInfoData 	poolcmd;

		initStringInfo(&poolcmd);
#endif
		/*
		 * Save new parameter value with the node manager.
		 * XXX here we may check: if value equals to configuration default
		 * just reset parameter instead. Minus one table entry, shorter SET
		 * command sent downn... Sounds like optimization.
		 */

		if (action == GUC_ACTION_LOCAL)
		{
			if (IsTransactionBlock())
				PGXCNodeSetParam(true, name, value, record->flags);
#if 0
			value = quote_guc_value(name, value, record->flags);
			appendStringInfo(&poolcmd, "SET LOCAL %s TO %s", name,
					(value ? value : "DEFAULT"));
#endif
		}
		else
		{
			PGXCNodeSetParam(false, name, value, record->flags);
#if 0
			value = quote_guc_value(name, value, record->flags);
			appendStringInfo(&poolcmd, "SET %s TO %s", name,
					(value ? value : "DEFAULT"));
#endif
		}
#if 0
		/*
		 * Send new value down to remote nodes if any is connected
		 * XXX here we are creatig a node and invoke a function that is trying
		 * to send some. That introduces some overhead, which may seem to be
		 * significant if application sets a bunch of parameters before doing
		 * anything useful - waste work for for each set statement.
		 * We may want to avoid that, by resetting the remote parameters and
		 * flagging that parameters needs to be updated before sending down next
		 * statement.
		 * On the other hand if session runs with a number of customized
		 * parameters and switching one, that would cause all values are resent.
		 * So let's go with "send immediately" approach: parameters are not set
		 * too often to care about overhead here.
		 */
		step = makeNode(RemoteQuery);
		step->combine_type = COMBINE_TYPE_SAME;
		step->exec_nodes = NULL;
		step->sql_statement = poolcmd.data;
		/* force_autocommit is actually does not start transaction on nodes */
		step->force_autocommit = true;
		step->exec_type = EXEC_ON_CURRENT;
		ExecRemoteUtility(step);
		pfree(step);
		pfree(poolcmd.data);
#endif
	}
#endif
#endif

	return changeVal ? 1 : -1;
}


/*
 * Set the fields for source file and line number the setting came from.
 */
static void
set_config_sourcefile(const char *name, char *sourcefile, int sourceline)
{
	struct config_generic *record;
	int			elevel;

	/*
	 * To avoid cluttering the log, only the postmaster bleats loudly about
	 * problems with the config file.
	 */
	elevel = IsUnderPostmaster ? DEBUG3 : LOG;

	record = find_option(name, true, elevel);
	/* should not happen */
	if (record == NULL)
		elog(ERROR, "unrecognized configuration parameter \"%s\"", name);

	sourcefile = guc_strdup(elevel, sourcefile);
	if (record->sourcefile)
		free(record->sourcefile);
	record->sourcefile = sourcefile;
	record->sourceline = sourceline;
}

/*
 * Set a config option to the given value.
 *
 * See also set_config_option; this is just the wrapper to be called from
 * outside GUC.  (This function should be used when possible, because its API
 * is more stable than set_config_option's.)
 *
 * Note: there is no support here for setting source file/line, as it
 * is currently not needed.
 */
void
SetConfigOption(const char *name, const char *value,
				GucContext context, GucSource source)
{
	(void) set_config_option(name, value, context, source,
							 GUC_ACTION_SET, true, 0, false);
}



/*
 * Fetch the current value of the option `name', as a string.
 *
 * If the option doesn't exist, return NULL if missing_ok is true (NOTE that
 * this cannot be distinguished from a string variable with a NULL value!),
 * otherwise throw an ereport and don't return.
 *
 * If restrict_superuser is true, we also enforce that only superusers can
 * see GUC_SUPERUSER_ONLY variables.  This should only be passed as true
 * in user-driven calls.
 *
 * The string is *not* allocated for modification and is really only
 * valid until the next call to configuration related functions.
 */
const char *
GetConfigOption(const char *name, bool missing_ok, bool restrict_superuser)
{
	struct config_generic *record;
	static char buffer[256];

	record = find_option(name, false, ERROR);
	if (record == NULL)
	{
		if (missing_ok)
			return NULL;
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
				 errmsg("unrecognized configuration parameter \"%s\"",
						name)));
	}
	if (restrict_superuser &&
		(record->flags & GUC_SUPERUSER_ONLY) &&
		!is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_ALL_SETTINGS))
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser or a member of pg_read_all_settings to examine \"%s\"",
						name)));

	switch (record->vartype)
	{
		case PGC_BOOL:
			return *((struct config_bool *) record)->variable ? "on" : "off";

		case PGC_INT:
			snprintf(buffer, sizeof(buffer), "%d",
					 *((struct config_int *) record)->variable);
			return buffer;

		case PGC_REAL:
			snprintf(buffer, sizeof(buffer), "%g",
					 *((struct config_real *) record)->variable);
			return buffer;

		case PGC_STRING:
			return *((struct config_string *) record)->variable;

		case PGC_ENUM:
			return config_enum_lookup_by_value((struct config_enum *) record,
											   *((struct config_enum *) record)->variable);
	}
	return NULL;
}

/*
 * Get the RESET value associated with the given option.
 *
 * Note: this is not re-entrant, due to use of static result buffer;
 * not to mention that a string variable could have its reset_val changed.
 * Beware of assuming the result value is good for very long.
 */
const char *
GetConfigOptionResetString(const char *name)
{
	struct config_generic *record;
	static char buffer[256];

	record = find_option(name, false, ERROR);
	if (record == NULL)
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
				 errmsg("unrecognized configuration parameter \"%s\"", name)));
	if ((record->flags & GUC_SUPERUSER_ONLY) &&
		!is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_ALL_SETTINGS))
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser or a member of pg_read_all_settings to examine \"%s\"",
						name)));

	switch (record->vartype)
	{
		case PGC_BOOL:
			return ((struct config_bool *) record)->reset_val ? "on" : "off";

		case PGC_INT:
			snprintf(buffer, sizeof(buffer), "%d",
					 ((struct config_int *) record)->reset_val);
			return buffer;

		case PGC_REAL:
			snprintf(buffer, sizeof(buffer), "%g",
					 ((struct config_real *) record)->reset_val);
			return buffer;

		case PGC_STRING:
			return ((struct config_string *) record)->reset_val;

		case PGC_ENUM:
			return config_enum_lookup_by_value((struct config_enum *) record,
											   ((struct config_enum *) record)->reset_val);
	}
	return NULL;
}

/*
 * Function to check if the GUC_LIST_QUOTE value is safe.
 * Comma-separated list is safe
 * Empty string is safe
 * Not an empty string or comma-separated list
 *
 * eg1. alter system set shared_preload_libraries="pg_stat_log,pg_squeeze";
 * eg2. alter system set shared_preload_libraries="";
 */
static bool
is_safe_guc_list_quote_value(const char *val)
{
	if (val == NULL || strcmp(val, "") == 0)
	{
		return true;
	}

	/* Check for list separated by commas */
	if (strchr(val, ',') != NULL)
	{
		return true;
	}

	return false;
}

/*
 * flatten_set_variable_args
 *		Given a parsenode List as emitted by the grammar for SET,
 *		convert to the flat string representation used by GUC.
 *
 * We need to be told the name of the variable the args are for, because
 * the flattening rules vary (ugh).
 *
 * The result is NULL if args is NIL (i.e., SET ... TO DEFAULT), otherwise
 * a palloc'd string.
 */
static char *
flatten_set_variable_args(const char *name, List *args)
{
	struct config_generic *record;
	int			flags;
	StringInfoData buf;
	ListCell   *l;

	/* Fast path if just DEFAULT */
	if (args == NIL)
		return NULL;

	/*
	 * Get flags for the variable; if it's not known, use default flags.
	 * (Caller might throw error later, but not our business to do so here.)
	 */
	record = find_option(name, false, WARNING);
	if (record)
		flags = record->flags;
	else
		flags = 0;

	/* Complain if list input and non-list variable */
	if ((flags & GUC_LIST_INPUT) == 0 &&
		list_length(args) != 1)
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
				 errmsg("SET %s takes only one argument", name)));

	initStringInfo(&buf);

	/*
	 * Each list member may be a plain A_Const node, or an A_Const within a
	 * TypeCast; the latter case is supported only for ConstInterval arguments
	 * (for SET TIME ZONE).
	 */
	foreach(l, args)
	{
		Node	   *arg = (Node *) lfirst(l);
		char	   *val;
		TypeName   *typeName = NULL;
		A_Const    *con;

		if (l != list_head(args))
			appendStringInfoString(&buf, ", ");

		if (IsA(arg, TypeCast))
		{
			TypeCast   *tc = (TypeCast *) arg;

			arg = tc->arg;
			typeName = tc->typeName;
		}

		if (!IsA(arg, A_Const))
			elog(ERROR, "unrecognized node type: %d", (int) nodeTag(arg));
		con = (A_Const *) arg;

		switch (nodeTag(&con->val))
		{
			case T_Integer:
				appendStringInfo(&buf, "%d", intVal(&con->val));
				break;
			case T_Float:
				/* represented as a string, so just copy it */
				appendStringInfoString(&buf, strVal(&con->val));
				break;
			case T_String:
				val = strVal(&con->val);
				if (typeName != NULL)
				{
					/*
					 * Must be a ConstInterval argument for TIME ZONE. Coerce
					 * to interval and back to normalize the value and account
					 * for any typmod.
					 */
					Oid			typoid;
					int32		typmod;
					Datum		interval;
					char	   *intervalout;

					typenameTypeIdAndMod(NULL, typeName, &typoid, &typmod, false);
					Assert(typoid == INTERVALOID);

					interval =
						DirectFunctionCall3(interval_in,
											CStringGetDatum(val),
											ObjectIdGetDatum(InvalidOid),
											Int32GetDatum(typmod));

					intervalout =
						DatumGetCString(DirectFunctionCall1(interval_out,
															interval));
					appendStringInfo(&buf, "INTERVAL '%s'", intervalout);
				}
				else
				{
					char * tmp_val = NULL;

					if (ORA_MODE && str_val_contain_ident(name) && con->lower_ident)
						tmp_val = upcase_identifier(val, strlen(val));

					/*
					 * Plain string literal or identifier.  For quote mode,
					 * quote it if it's not a vanilla identifier.
					 */
					if (flags & GUC_LIST_QUOTE && !is_safe_guc_list_quote_value(val))
					{
						if (ORA_MODE && str_val_contain_ident(name))
							appendStringInfoString(&buf, quote_identifier(tmp_val ? tmp_val : val));
						else
							appendStringInfoString(&buf, quote_identifier_as_pg(val));
					}
					else
						appendStringInfoString(&buf, tmp_val ? tmp_val : val);

					if (tmp_val)
						pfree(tmp_val);
				}
				break;
			default:
				elog(ERROR, "unrecognized node type: %d",
					 (int) nodeTag(&con->val));
				break;
		}
	}

	return buf.data;
}

/*
 * Write updated configuration parameter values into a temporary file.
 * This function traverses the list of parameters and quotes the string
 * values before writing them.
 */
static void
write_auto_conf_file(int fd, const char *filename, ConfigVariable *head)
{
	StringInfoData buf;
	ConfigVariable *item;

	initStringInfo(&buf);

	/* Emit file header containing warning comment */
	appendStringInfoString(&buf, "# Do not edit this file manually!\n");
	appendStringInfoString(&buf, "# It will be overwritten by ALTER SYSTEM command.\n");

	errno = 0;
	if (write(fd, buf.data, buf.len) != buf.len)
	{
		/* if write didn't set errno, assume problem is no disk space */
		if (errno == 0)
			errno = ENOSPC;
		ereport(ERROR,
				(errcode_for_file_access(),
				 errmsg("could not write to file \"%s\": %m", filename)));
	}

	/* Emit each parameter, properly quoting the value */
	for (item = head; item != NULL; item = item->next)
	{
		char	   *escaped;

		resetStringInfo(&buf);

		appendStringInfoString(&buf, item->name);
		appendStringInfoString(&buf, " = '");

		escaped = escape_single_quotes_ascii(item->value);
		if (!escaped)
			ereport(ERROR,
					(errcode(ERRCODE_OUT_OF_MEMORY),
					 errmsg("out of memory")));
		appendStringInfoString(&buf, escaped);
		free(escaped);

		appendStringInfoString(&buf, "'\n");

		errno = 0;
		if (write(fd, buf.data, buf.len) != buf.len)
		{
			/* if write didn't set errno, assume problem is no disk space */
			if (errno == 0)
				errno = ENOSPC;
			ereport(ERROR,
					(errcode_for_file_access(),
					 errmsg("could not write to file \"%s\": %m", filename)));
		}
	}

	/* fsync before considering the write to be successful */
	if (pg_fsync(fd) != 0)
		ereport(ERROR,
				(errcode_for_file_access(),
				 errmsg("could not fsync file \"%s\": %m", filename)));

	pfree(buf.data);
}

/*
 * Update the given list of configuration parameters, adding, replacing
 * or deleting the entry for item "name" (delete if "value" == NULL).
 */
static void
replace_auto_config_value(ConfigVariable **head_p, ConfigVariable **tail_p,
						  const char *name, const char *value)
{
	ConfigVariable *item,
			   *prev = NULL;

	/* Search the list for an existing match (we assume there's only one) */
	for (item = *head_p; item != NULL; item = item->next)
	{
		if (strcmp(item->name, name) == 0)
		{
			/* found a match, replace it */
			pfree(item->value);
			if (value != NULL)
			{
				/* update the parameter value */
				item->value = pstrdup(value);
			}
			else
			{
				/* delete the configuration parameter from list */
				if (*head_p == item)
					*head_p = item->next;
				else
					prev->next = item->next;
				if (*tail_p == item)
					*tail_p = prev;

				pfree(item->name);
				pfree(item->filename);
				pfree(item);
			}
			return;
		}
		prev = item;
	}

	/* Not there; no work if we're trying to delete it */
	if (value == NULL)
		return;

	/* OK, append a new entry */
	item = palloc(sizeof *item);
	item->name = pstrdup(name);
	item->value = pstrdup(value);
	item->errmsg = NULL;
	item->filename = pstrdup("");	/* new item has no location */
	item->sourceline = 0;
	item->ignore = false;
	item->applied = false;
	item->next = NULL;

	if (*head_p == NULL)
		*head_p = item;
	else
		(*tail_p)->next = item;
	*tail_p = item;
}


/*
 * Execute ALTER SYSTEM statement.
 *
 * Read the old PG_AUTOCONF_FILENAME file, merge in the new variable value,
 * and write out an updated file.  If the command is ALTER SYSTEM RESET ALL,
 * we can skip reading the old file and just write an empty file.
 *
 * An LWLock is used to serialize updates of the configuration file.
 *
 * In case of an error, we leave the original automatic
 * configuration file (PG_AUTOCONF_FILENAME) intact.
 */
void
AlterSystemSetConfigFile(AlterSystemStmt *altersysstmt)
{
	char	   *name;
	char	   *value;
	bool		resetall = false;
	ConfigVariable *head = NULL;
	ConfigVariable *tail = NULL;
	volatile int Tmpfd;
	char		AutoConfFileName[MAXPGPATH];
	char		AutoConfTmpFileName[MAXPGPATH];

	if (!superuser())
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 (errmsg("must be superuser to execute ALTER SYSTEM command"))));

	/*
	 * Extract statement arguments
	 */
	name = altersysstmt->setstmt->name;

	switch (altersysstmt->setstmt->kind)
	{
		case VAR_SET_VALUE:
			value = ExtractSetVariableArgs(altersysstmt->setstmt);
			break;

		case VAR_SET_DEFAULT:
		case VAR_RESET:
			value = NULL;
			break;

		case VAR_RESET_ALL:
			value = NULL;
			resetall = true;
			break;

		default:
			elog(ERROR, "unrecognized alter system stmt type: %d",
				 altersysstmt->setstmt->kind);
			break;
	}

	/*
	 * Unless it's RESET_ALL, validate the target variable and value
	 */
	if (!resetall)
	{
		struct config_generic *record;

		record = find_option(name, false, ERROR);
		if (record == NULL)
			ereport(ERROR,
					(errcode(ERRCODE_UNDEFINED_OBJECT),
					 errmsg("unrecognized configuration parameter \"%s\"",
							name)));

		/*
		 * Don't allow parameters that can't be set in configuration files to
		 * be set in PG_AUTOCONF_FILENAME file.
		 */
		if ((record->context == PGC_INTERNAL) ||
			(record->flags & GUC_DISALLOW_IN_FILE) ||
			(record->flags & GUC_DISALLOW_IN_AUTO_FILE))
			ereport(ERROR,
					(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
					 errmsg("parameter \"%s\" cannot be changed",
							name)));

		/*
		 * If a value is specified, verify that it's sane.
		 */
		if (value)
		{
			union config_var_val newval;
			void	   *newextra = NULL;

			/* Check that it's acceptable for the indicated parameter */
			if (!parse_and_validate_value(record, name, value,
										  PGC_S_FILE, ERROR,
										  &newval, &newextra))
				ereport(ERROR,
						(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
						 errmsg("invalid value for parameter \"%s\": \"%s\"",
								name, value)));

			if (record->vartype == PGC_STRING && newval.stringval != NULL)
				free(newval.stringval);
			if (newextra)
				free(newextra);

			/*
			 * We must also reject values containing newlines, because the
			 * grammar for config files doesn't support embedded newlines in
			 * string literals.
			 */
			if (strchr(value, '\n'))
				ereport(ERROR,
						(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
						 errmsg("parameter value for ALTER SYSTEM must not contain a newline")));
		}
	}

	/*
	 * PG_AUTOCONF_FILENAME and its corresponding temporary file are always in
	 * the data directory, so we can reference them by simple relative paths.
	 */
	snprintf(AutoConfFileName, sizeof(AutoConfFileName), "%s",
			 PG_AUTOCONF_FILENAME);
	snprintf(AutoConfTmpFileName, sizeof(AutoConfTmpFileName), "%s.%s",
			 AutoConfFileName,
			 "tmp");

	/*
	 * Only one backend is allowed to operate on PG_AUTOCONF_FILENAME at a
	 * time.  Use AutoFileLock to ensure that.  We must hold the lock while
	 * reading the old file contents.
	 */
	LWLockAcquire(AutoFileLock, LW_EXCLUSIVE);

	/*
	 * If we're going to reset everything, then no need to open or parse the
	 * old file.  We'll just write out an empty list.
	 */
	if (!resetall)
	{
		struct stat st;

		if (stat(AutoConfFileName, &st) == 0)
		{
			/* open old file PG_AUTOCONF_FILENAME */
			FILE	   *infile;

			infile = AllocateFile(AutoConfFileName, "r");
			if (infile == NULL)
				ereport(ERROR,
						(errcode_for_file_access(),
						 errmsg("could not open file \"%s\": %m",
								AutoConfFileName)));

			/* parse it */
			if (!ParseConfigFp(infile, AutoConfFileName, 0, LOG, &head, &tail))
				ereport(ERROR,
						(errcode(ERRCODE_CONFIG_FILE_ERROR),
						 errmsg("could not parse contents of file \"%s\"",
								AutoConfFileName)));

			FreeFile(infile);
		}

		/*
		 * Now, replace any existing entry with the new value, or add it if
		 * not present.
		 */
		replace_auto_config_value(&head, &tail, name, value);
	}

	/*
	 * To ensure crash safety, first write the new file data to a temp file,
	 * then atomically rename it into place.
	 *
	 * If there is a temp file left over due to a previous crash, it's okay to
	 * truncate and reuse it.
	 */
	Tmpfd = BasicOpenFile(AutoConfTmpFileName,
						  O_CREAT | O_RDWR | O_TRUNC);
	if (Tmpfd < 0)
		ereport(ERROR,
				(errcode_for_file_access(),
				 errmsg("could not open file \"%s\": %m",
						AutoConfTmpFileName)));

	/*
	 * Use a TRY block to clean up the file if we fail.  Since we need a TRY
	 * block anyway, OK to use BasicOpenFile rather than OpenTransientFile.
	 */
	PG_TRY();
	{
		/* Write and sync the new contents to the temporary file */
		write_auto_conf_file(Tmpfd, AutoConfTmpFileName, head);

		/* Close before renaming; may be required on some platforms */
		close(Tmpfd);
		Tmpfd = -1;

		/*
		 * As the rename is atomic operation, if any problem occurs after this
		 * at worst it can lose the parameters set by last ALTER SYSTEM
		 * command.
		 */
		durable_rename(AutoConfTmpFileName, AutoConfFileName, ERROR);
	}
	PG_CATCH();
	{
		/* Close file first, else unlink might fail on some platforms */
		if (Tmpfd >= 0)
			close(Tmpfd);

		/* Unlink, but ignore any error */
		(void) unlink(AutoConfTmpFileName);

		PG_RE_THROW();
	}
	PG_END_TRY();

	FreeConfigVariables(head);

	LWLockRelease(AutoFileLock);
}

/*
 * SET command
 */
void
ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel)
{
	GucAction	action = stmt->is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET;

	/*
	 * Workers synchronize these parameters at the start of the parallel
	 * operation; then, we block SET during the operation.
	 */
	if (IsInParallelMode())
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_TRANSACTION_STATE),
				 errmsg("cannot set parameters during a parallel operation")));

	switch (stmt->kind)
	{
		case VAR_SET_VALUE:
		case VAR_SET_CURRENT:
			if (stmt->is_local)
				WarnNoTransactionChain(isTopLevel, "SET LOCAL");
			(void) set_config_option(stmt->name,
									 ExtractSetVariableArgs(stmt),
									 (superuser() ? PGC_SUSET : PGC_USERSET),
									 PGC_S_SESSION,
									 action, true, 0, false);
			break;
		case VAR_SET_MULTI:

			/*
			 * Special-case SQL syntaxes.  The TRANSACTION and SESSION
			 * CHARACTERISTICS cases effectively set more than one variable
			 * per statement.  TRANSACTION SNAPSHOT only takes one argument,
			 * but we put it here anyway since it's a special case and not
			 * related to any GUC variable.
			 */
			if (strcmp(stmt->name, "TRANSACTION") == 0)
			{
				ListCell   *head;

#ifdef XCP
				/* SET TRANSACTION assumes "local" */
				stmt->is_local = true;
#endif
				WarnNoTransactionChain(isTopLevel, "SET TRANSACTION");

				foreach(head, stmt->args)
				{
					DefElem    *item = (DefElem *) lfirst(head);

					if (strcmp(item->defname, "transaction_isolation") == 0)
						SetPGVariable("transaction_isolation",
									  list_make1(item->arg), stmt->is_local);
					else if (strcmp(item->defname, "transaction_read_only") == 0)
						SetPGVariable("transaction_read_only",
									  list_make1(item->arg), stmt->is_local);
					else if (strcmp(item->defname, "transaction_deferrable") == 0)
						SetPGVariable("transaction_deferrable",
									  list_make1(item->arg), stmt->is_local);
					else
						elog(ERROR, "unexpected SET TRANSACTION element: %s",
							 item->defname);
				}
			}
			else if (strcmp(stmt->name, "SESSION CHARACTERISTICS") == 0)
			{
				ListCell   *head;

#ifdef XCP
				/* SET SESSION CHARACTERISTICS assumes "session" */
				stmt->is_local = false;
#endif

				foreach(head, stmt->args)
				{
					DefElem    *item = (DefElem *) lfirst(head);

					if (strcmp(item->defname, "transaction_isolation") == 0)
						SetPGVariable("default_transaction_isolation",
									  list_make1(item->arg), stmt->is_local);
					else if (strcmp(item->defname, "transaction_read_only") == 0)
						SetPGVariable("default_transaction_read_only",
									  list_make1(item->arg), stmt->is_local);
					else if (strcmp(item->defname, "transaction_deferrable") == 0)
						SetPGVariable("default_transaction_deferrable",
									  list_make1(item->arg), stmt->is_local);
					else
						elog(ERROR, "unexpected SET SESSION element: %s",
							 item->defname);
				}
			}
			else if (strcmp(stmt->name, "TRANSACTION SNAPSHOT") == 0)
			{
				A_Const    *con = linitial_node(A_Const, stmt->args);

				if (stmt->is_local)
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("SET LOCAL TRANSACTION SNAPSHOT is not implemented")));

				WarnNoTransactionChain(isTopLevel, "SET TRANSACTION");
				Assert(nodeTag(&con->val) == T_String);
				ImportSnapshot(strVal(&con->val));
			}
			else
				elog(ERROR, "unexpected SET MULTI element: %s",
					 stmt->name);
			break;
		case VAR_SET_DEFAULT:
			if (stmt->is_local)
				WarnNoTransactionChain(isTopLevel, "SET LOCAL");
			/* fall through */
		case VAR_RESET:
//			if (strcmp(stmt->name, "transaction_isolation") == 0)
//				WarnNoTransactionChain(isTopLevel, "RESET TRANSACTION");

			(void) set_config_option(stmt->name,
									 NULL,
									 (superuser() ? PGC_SUSET : PGC_USERSET),
									 PGC_S_SESSION,
									 action, true, 0, false);
			break;
		case VAR_RESET_ALL:
			ResetAllOptions(false, false);
			break;
	}
}

/*
 * Get the value to assign for a VariableSetStmt, or NULL if it's RESET.
 * The result is palloc'd.
 *
 * This is exported for use by actions such as ALTER ROLE SET.
 */
char *
ExtractSetVariableArgs(VariableSetStmt *stmt)
{
	switch (stmt->kind)
	{
		case VAR_SET_VALUE:
			return flatten_set_variable_args(stmt->name, stmt->args);
		case VAR_SET_CURRENT:
			return GetConfigOptionByName(stmt->name, NULL, false);
		default:
			return NULL;
	}
}

/*
 * SetPGVariable - SET command exported as an easily-C-callable function.
 *
 * This provides access to SET TO value, as well as SET TO DEFAULT (expressed
 * by passing args == NIL), but not SET FROM CURRENT functionality.
 */
void
SetPGVariable(const char *name, List *args, bool is_local)
{
	char	   *argstring = flatten_set_variable_args(name, args);

	/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
	(void) set_config_option(name,
							 argstring,
							 (superuser() ? PGC_SUSET : PGC_USERSET),
							 PGC_S_SESSION,
							 is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
							 true, 0, false);
}

/*
 * SET command wrapped as a SQL callable function.
 */
Datum
set_config_by_name(PG_FUNCTION_ARGS)
{
	char	   *name;
	char	   *value;
	char	   *new_value;
	bool		is_local;

	if (PG_ARGISNULL(0))
		ereport(ERROR,
				(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
				 errmsg("SET requires parameter name")));

	/* Get the GUC variable name */
	name = TextDatumGetCString(PG_GETARG_DATUM(0));

	/* Get the desired value or set to NULL for a reset request */
	if (PG_ARGISNULL(1))
		value = NULL;
	else
		value = TextDatumGetCString(PG_GETARG_DATUM(1));

	/*
	 * Get the desired state of is_local. Default to false if provided value
	 * is NULL
	 */
	if (PG_ARGISNULL(2))
		is_local = false;
	else
		is_local = PG_GETARG_BOOL(2);

	/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
	(void) set_config_option(name,
							 value,
							 (superuser() ? PGC_SUSET : PGC_USERSET),
							 PGC_S_SESSION,
							 is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
							 true, 0, false);

	/* get the new current value */
	new_value = GetConfigOptionByName(name, NULL, false);

	/* Convert return string to text */
	PG_RETURN_TEXT_P(cstring_to_text(new_value));
}


/*
 * Common code for DefineCustomXXXVariable subroutines: allocate the
 * new variable's config struct and fill in generic fields.
 */
static struct config_generic *
init_custom_variable(const char *name,
					 const char *short_desc,
					 const char *long_desc,
					 GucContext context,
					 int flags,
					 enum config_type type,
					 size_t sz)
{
	struct config_generic *gen;

	/*
	 * Only allow custom PGC_POSTMASTER variables to be created during shared
	 * library preload; any later than that, we can't ensure that the value
	 * doesn't change after startup.  This is a fatal elog if it happens; just
	 * erroring out isn't safe because we don't know what the calling loadable
	 * module might already have hooked into.
	 */
	if (context == PGC_POSTMASTER &&
		!process_shared_preload_libraries_in_progress)
		elog(FATAL, "cannot create PGC_POSTMASTER variables after startup");

	/*
	 * Before pljava commit 398f3b876ed402bdaec8bc804f29e2be95c75139
	 * (2015-12-15), two of that module's PGC_USERSET variables facilitated
	 * trivial escalation to superuser privileges.  Restrict the variables to
	 * protect sites that have yet to upgrade pljava.
	 */
	if (context == PGC_USERSET &&
		(strcmp(name, "pljava.classpath") == 0 ||
		 strcmp(name, "pljava.vmoptions") == 0))
		context = PGC_SUSET;

	gen = (struct config_generic *) guc_malloc(ERROR, sz);
	memset(gen, 0, sz);

	gen->name = guc_strdup(ERROR, name);
	gen->context = context;
	gen->group = CUSTOM_OPTIONS;
	gen->short_desc = short_desc;
	gen->long_desc = long_desc;
	gen->flags = flags;
	gen->vartype = type;

	return gen;
}

/*
 * Common code for DefineCustomXXXVariable subroutines: insert the new
 * variable into the GUC variable array, replacing any placeholder.
 */
static void
define_custom_variable(struct config_generic *variable)
{
	const char *name = variable->name;
	const char **nameAddr = &name;
	struct config_string *pHolder;
	struct config_generic **res;

	/*
	 * See if there's a placeholder by the same name.
	 */
	res = (struct config_generic **) bsearch((void *) &nameAddr,
											 (void *) guc_variables,
											 num_guc_variables,
											 sizeof(struct config_generic *),
											 guc_var_compare);
	if (res == NULL)
	{
		/*
		 * No placeholder to replace, so we can just add it ... but first,
		 * make sure it's initialized to its default value.
		 */
		InitializeOneGUCOption(variable);
		add_guc_variable(variable, ERROR);
		return;
	}

	/*
	 * This better be a placeholder
	 */
	if (((*res)->flags & GUC_CUSTOM_PLACEHOLDER) == 0)
		ereport(ERROR,
				(errcode(ERRCODE_INTERNAL_ERROR),
				 errmsg("attempt to redefine parameter \"%s\"", name)));

	Assert((*res)->vartype == PGC_STRING);
	pHolder = (struct config_string *) (*res);

	/*
	 * First, set the variable to its default value.  We must do this even
	 * though we intend to immediately apply a new value, since it's possible
	 * that the new value is invalid.
	 */
	InitializeOneGUCOption(variable);

	/*
	 * Replace the placeholder. We aren't changing the name, so no re-sorting
	 * is necessary
	 */
	*res = variable;

	/*
	 * Assign the string value(s) stored in the placeholder to the real
	 * variable.  Essentially, we need to duplicate all the active and stacked
	 * values, but with appropriate validation and datatype adjustment.
	 *
	 * If an assignment fails, we report a WARNING and keep going.  We don't
	 * want to throw ERROR for bad values, because it'd bollix the add-on
	 * module that's presumably halfway through getting loaded.  In such cases
	 * the default or previous state will become active instead.
	 */

	/* First, apply the reset value if any */
	if (pHolder->reset_val)
		(void) set_config_option(name, pHolder->reset_val,
								 pHolder->gen.reset_scontext,
								 pHolder->gen.reset_source,
								 GUC_ACTION_SET, true, WARNING, false);
	/* That should not have resulted in stacking anything */
	Assert(variable->stack == NULL);

	/* Now, apply current and stacked values, in the order they were stacked */
	reapply_stacked_values(variable, pHolder, pHolder->gen.stack,
						   *(pHolder->variable),
						   pHolder->gen.scontext, pHolder->gen.source);

	/* Also copy over any saved source-location information */
	if (pHolder->gen.sourcefile)
		set_config_sourcefile(name, pHolder->gen.sourcefile,
							  pHolder->gen.sourceline);

	/*
	 * Free up as much as we conveniently can of the placeholder structure.
	 * (This neglects any stack items, so it's possible for some memory to be
	 * leaked.  Since this can only happen once per session per variable, it
	 * doesn't seem worth spending much code on.)
	 */
	set_string_field(pHolder, pHolder->variable, NULL);
	set_string_field(pHolder, &pHolder->reset_val, NULL);

	free(pHolder);
}

/*
 * Recursive subroutine for define_custom_variable: reapply non-reset values
 *
 * We recurse so that the values are applied in the same order as originally.
 * At each recursion level, apply the upper-level value (passed in) in the
 * fashion implied by the stack entry.
 */
static void
reapply_stacked_values(struct config_generic *variable,
					   struct config_string *pHolder,
					   GucStack *stack,
					   const char *curvalue,
					   GucContext curscontext, GucSource cursource)
{
	const char *name = variable->name;
	GucStack   *oldvarstack = variable->stack;

	if (stack != NULL)
	{
		/* First, recurse, so that stack items are processed bottom to top */
		reapply_stacked_values(variable, pHolder, stack->prev,
							   stack->prior.val.stringval,
							   stack->scontext, stack->source);

		/* See how to apply the passed-in value */
		switch (stack->state)
		{
			case GUC_SAVE:
				(void) set_config_option(name, curvalue,
										 curscontext, cursource,
										 GUC_ACTION_SAVE, true,
										 WARNING, false);
				break;

			case GUC_SET:
				(void) set_config_option(name, curvalue,
										 curscontext, cursource,
										 GUC_ACTION_SET, true,
										 WARNING, false);
				break;

			case GUC_LOCAL:
				(void) set_config_option(name, curvalue,
										 curscontext, cursource,
										 GUC_ACTION_LOCAL, true,
										 WARNING, false);
				break;

			case GUC_SET_LOCAL:
				/* first, apply the masked value as SET */
				(void) set_config_option(name, stack->masked.val.stringval,
										 stack->masked_scontext, PGC_S_SESSION,
										 GUC_ACTION_SET, true,
										 WARNING, false);
				/* then apply the current value as LOCAL */
				(void) set_config_option(name, curvalue,
										 curscontext, cursource,
										 GUC_ACTION_LOCAL, true,
										 WARNING, false);
				break;
		}

		/* If we successfully made a stack entry, adjust its nest level */
		if (variable->stack != oldvarstack)
			variable->stack->nest_level = stack->nest_level;
	}
	else
	{
		/*
		 * We are at the end of the stack.  If the active/previous value is
		 * different from the reset value, it must represent a previously
		 * committed session value.  Apply it, and then drop the stack entry
		 * that set_config_option will have created under the impression that
		 * this is to be just a transactional assignment.  (We leak the stack
		 * entry.)
		 */
		if (curvalue != pHolder->reset_val ||
			curscontext != pHolder->gen.reset_scontext ||
			cursource != pHolder->gen.reset_source)
		{
			(void) set_config_option(name, curvalue,
									 curscontext, cursource,
									 GUC_ACTION_SET, true, WARNING, false);
			variable->stack = NULL;
		}
	}
}

void
DefineCustomBoolVariable(const char *name,
						 const char *short_desc,
						 const char *long_desc,
						 bool *valueAddr,
						 bool bootValue,
						 GucContext context,
						 int flags,
						 GucBoolCheckHook check_hook,
						 GucBoolAssignHook assign_hook,
						 GucShowHook show_hook)
{
	struct config_bool *var;

	var = (struct config_bool *)
		init_custom_variable(name, short_desc, long_desc, context, flags,
							 PGC_BOOL, sizeof(struct config_bool));
	var->variable = valueAddr;
	var->boot_val = bootValue;
	var->reset_val = bootValue;
	var->check_hook = check_hook;
	var->assign_hook = assign_hook;
	var->show_hook = show_hook;
	define_custom_variable(&var->gen);
}

void
DefineCustomIntVariable(const char *name,
						const char *short_desc,
						const char *long_desc,
						int *valueAddr,
						int bootValue,
						int minValue,
						int maxValue,
						GucContext context,
						int flags,
						GucIntCheckHook check_hook,
						GucIntAssignHook assign_hook,
						GucShowHook show_hook)
{
	struct config_int *var;

	var = (struct config_int *)
		init_custom_variable(name, short_desc, long_desc, context, flags,
							 PGC_INT, sizeof(struct config_int));
	var->variable = valueAddr;
	var->boot_val = bootValue;
	var->reset_val = bootValue;
	var->min = minValue;
	var->max = maxValue;
	var->check_hook = check_hook;
	var->assign_hook = assign_hook;
	var->show_hook = show_hook;
	define_custom_variable(&var->gen);
}

void
DefineCustomRealVariable(const char *name,
						 const char *short_desc,
						 const char *long_desc,
						 double *valueAddr,
						 double bootValue,
						 double minValue,
						 double maxValue,
						 GucContext context,
						 int flags,
						 GucRealCheckHook check_hook,
						 GucRealAssignHook assign_hook,
						 GucShowHook show_hook)
{
	struct config_real *var;

	var = (struct config_real *)
		init_custom_variable(name, short_desc, long_desc, context, flags,
							 PGC_REAL, sizeof(struct config_real));
	var->variable = valueAddr;
	var->boot_val = bootValue;
	var->reset_val = bootValue;
	var->min = minValue;
	var->max = maxValue;
	var->check_hook = check_hook;
	var->assign_hook = assign_hook;
	var->show_hook = show_hook;
	define_custom_variable(&var->gen);
}

void
DefineCustomStringVariable(const char *name,
						   const char *short_desc,
						   const char *long_desc,
						   char **valueAddr,
						   const char *bootValue,
						   GucContext context,
						   int flags,
						   GucStringCheckHook check_hook,
						   GucStringAssignHook assign_hook,
						   GucShowHook show_hook)
{
	struct config_string *var;

	var = (struct config_string *)
		init_custom_variable(name, short_desc, long_desc, context, flags,
							 PGC_STRING, sizeof(struct config_string));
	var->variable = valueAddr;
	var->boot_val = bootValue;
	var->check_hook = check_hook;
	var->assign_hook = assign_hook;
	var->show_hook = show_hook;
	define_custom_variable(&var->gen);
}

void
DefineCustomEnumVariable(const char *name,
						 const char *short_desc,
						 const char *long_desc,
						 int *valueAddr,
						 int bootValue,
						 const struct config_enum_entry *options,
						 GucContext context,
						 int flags,
						 GucEnumCheckHook check_hook,
						 GucEnumAssignHook assign_hook,
						 GucShowHook show_hook)
{
	struct config_enum *var;

	var = (struct config_enum *)
		init_custom_variable(name, short_desc, long_desc, context, flags,
							 PGC_ENUM, sizeof(struct config_enum));
	var->variable = valueAddr;
	var->boot_val = bootValue;
	var->reset_val = bootValue;
	var->options = options;
	var->check_hook = check_hook;
	var->assign_hook = assign_hook;
	var->show_hook = show_hook;
	define_custom_variable(&var->gen);
}

void
EmitWarningsOnPlaceholders(const char *className)
{
	int			classLen = strlen(className);
	int			i;

	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *var = guc_variables[i];

		if ((var->flags & GUC_CUSTOM_PLACEHOLDER) != 0 &&
			strncmp(className, var->name, classLen) == 0 &&
			var->name[classLen] == GUC_QUALIFIER_SEPARATOR)
		{
			ereport(WARNING,
					(errcode(ERRCODE_UNDEFINED_OBJECT),
					 errmsg("unrecognized configuration parameter \"%s\"",
							var->name)));
		}
	}
}


/*
 * SHOW command
 */
void
GetPGVariable(const char *name, DestReceiver *dest)
{
	if (guc_name_compare(name, "all") == 0)
		ShowAllGUCConfig(dest);
	else
		ShowGUCConfigOption(name, dest);
}

TupleDesc
GetPGVariableResultDesc(const char *name)
{
	TupleDesc	tupdesc;

	if (guc_name_compare(name, "all") == 0)
	{
		/* need a tuple descriptor representing three TEXT columns */
		tupdesc = CreateTemplateTupleDesc(3, false);
		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
						   TEXTOID, -1, 0);
	}
	else
	{
		const char *varname;

		/* Get the canonical spelling of name */
		(void) GetConfigOptionByName(name, &varname, false);

		/* need a tuple descriptor representing a single TEXT column */
		tupdesc = CreateTemplateTupleDesc(1, false);
		TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
						   TEXTOID, -1, 0);
	}
	return tupdesc;
}


/*
 * SHOW command
 */
static void
ShowGUCConfigOption(const char *name, DestReceiver *dest)
{
	TupOutputState *tstate;
	TupleDesc	tupdesc;
	const char *varname;
	char	   *value;

	/* Get the value and canonical spelling of name */
	value = GetConfigOptionByName(name, &varname, false);

	/* need a tuple descriptor representing a single TEXT column */
	tupdesc = CreateTemplateTupleDesc(1, false);
	TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 1, varname,
							  TEXTOID, -1, 0);

	/* prepare for projection of tuples */
	tstate = begin_tup_output_tupdesc(dest, tupdesc);

	/* Send it */
	do_text_output_oneline(tstate, value);

	end_tup_output(tstate);
}

/*
 * SHOW ALL command
 */
static void
ShowAllGUCConfig(DestReceiver *dest)
{
	bool		am_superuser = superuser();
	int			i;
	TupOutputState *tstate;
	TupleDesc	tupdesc;
	Datum		values[3];
	bool		isnull[3] = {false, false, false};

	/* need a tuple descriptor representing three TEXT columns */
	tupdesc = CreateTemplateTupleDesc(3, false);
	TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 1, "name",
							  TEXTOID, -1, 0);
	TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 2, "setting",
							  TEXTOID, -1, 0);
	TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 3, "description",
							  TEXTOID, -1, 0);

	/* prepare for projection of tuples */
	tstate = begin_tup_output_tupdesc(dest, tupdesc);

	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *conf = guc_variables[i];
		char	   *setting;

		if ((conf->flags & GUC_NO_SHOW_ALL) ||
			((conf->flags & GUC_SUPERUSER_ONLY) && !am_superuser))
			continue;

		/* assign to the values array */
		values[0] = PointerGetDatum(cstring_to_text(conf->name));

		setting = _ShowOption(conf, true);
		if (setting)
		{
			values[1] = PointerGetDatum(cstring_to_text(setting));
			isnull[1] = false;
		}
		else
		{
			values[1] = PointerGetDatum(NULL);
			isnull[1] = true;
		}

		values[2] = PointerGetDatum(cstring_to_text(conf->short_desc));

		/* send it to dest */
		do_tup_output(tstate, values, isnull);

		/* clean up */
		pfree(DatumGetPointer(values[0]));
		if (setting)
		{
			pfree(setting);
			pfree(DatumGetPointer(values[1]));
		}
		pfree(DatumGetPointer(values[2]));
	}

	end_tup_output(tstate);
}

/*
 * Returns an array of modified GUC options to show in EXPLAIN. Only options
 * related to query planning (marked with GUC_EXPLAIN), with values different
 * from built-in defaults.
 */
struct config_generic **
get_explain_guc_options(int *num)
{
	int		i;
	struct config_generic **result;

	*num = 0;

	/*
	 * Allocate enough space to fit all GUC_EXPLAIN options. We may not
	 * need all the space, but there are fairly few such options so we
	 * don't waste a lot of memory.
	 */
	result = palloc(sizeof(struct config_generic *) * num_guc_explain_variables);

	for (i = 0; i < num_guc_variables; i++)
	{
		bool modified;
		struct config_generic *conf = guc_variables[i];

		/* return only options visible to the user */
		if ((conf->flags & GUC_NO_SHOW_ALL) ||
			((conf->flags & GUC_SUPERUSER_ONLY) &&
			 !is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_ALL_SETTINGS)))
			continue;

		/* only parameters explicitly marked for inclusion in explain */
		if (!(conf->flags & GUC_EXPLAIN))
			continue;

		/* return only options that were modified (w.r.t. config file) */
		modified = false;

		switch (conf->vartype)
		{
			case PGC_BOOL:
			{
				struct config_bool *lconf = (struct config_bool *) conf;
				modified = (lconf->boot_val != *(lconf->variable));
			}
			break;

			case PGC_INT:
				{
					struct config_int *lconf = (struct config_int *) conf;
					modified = (lconf->boot_val != *(lconf->variable));
				}
				break;

			case PGC_REAL:
				{
					struct config_real *lconf = (struct config_real *) conf;
					modified = (lconf->boot_val != *(lconf->variable));
				}
				break;

			case PGC_STRING:
				{
					struct config_string *lconf = (struct config_string *) conf;
					modified = (strcmp(lconf->boot_val, *(lconf->variable)) != 0);
				}
				break;

			case PGC_ENUM:
				{
					struct config_enum *lconf = (struct config_enum *) conf;
					modified = (lconf->boot_val != *(lconf->variable));
				}
				break;

			default:
				elog(ERROR, "unexpected GUC type: %d", conf->vartype);
		}

		/* skip GUC variables that match the built-in default */
		if (!modified)
			continue;

		/* assign to the values array */
		result[*num] = conf;
		*num = *num + 1;

		Assert(*num <= num_guc_explain_variables);
	}

	return result;
}

/*
 * Return GUC variable value by name; optionally return canonical form of
 * name.  If the GUC is unset, then throw an error unless missing_ok is true,
 * in which case return NULL.  Return value is palloc'd (but *varname isn't).
 */
char *
GetConfigOptionByName(const char *name, const char **varname, bool missing_ok)
{
	struct config_generic *record;

	record = find_option(name, false, ERROR);
	if (record == NULL)
	{
		if (missing_ok)
		{
			if (varname)
				*varname = NULL;
			return NULL;
		}

		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
				 errmsg("unrecognized configuration parameter \"%s\"", name)));
	}

	if ((record->flags & GUC_SUPERUSER_ONLY) &&
		!is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_ALL_SETTINGS))
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser or a member of pg_read_all_settings to examine \"%s\"",
						name)));

	if (varname)
		*varname = record->name;

	return _ShowOption(record, true);
}

/*
 * Return GUC variable value by variable number; optionally return canonical
 * form of name.  Return value is palloc'd.
 */
void
GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
{
	char		buffer[256];
	struct config_generic *conf;

	/* check requested variable number valid */
	Assert((varnum >= 0) && (varnum < num_guc_variables));

	conf = guc_variables[varnum];

	if (noshow)
	{
		if ((conf->flags & GUC_NO_SHOW_ALL) ||
			((conf->flags & GUC_SUPERUSER_ONLY) &&
			 !is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_ALL_SETTINGS)))
			*noshow = true;
		else
			*noshow = false;
	}

	/* first get the generic attributes */

	/* name */
	values[0] = conf->name;

	/* setting : use _ShowOption in order to avoid duplicating the logic */
	values[1] = _ShowOption(conf, false);

	/* unit */
	if (conf->vartype == PGC_INT)
	{
		switch (conf->flags & (GUC_UNIT_MEMORY | GUC_UNIT_TIME))
		{
			case GUC_UNIT_KB:
				values[2] = "kB";
				break;
			case GUC_UNIT_MB:
				values[2] = "MB";
				break;
			case GUC_UNIT_BLOCKS:
				snprintf(buffer, sizeof(buffer), "%dkB", BLCKSZ / 1024);
				values[2] = pstrdup(buffer);
				break;
			case GUC_UNIT_XBLOCKS:
				snprintf(buffer, sizeof(buffer), "%dkB", XLOG_BLCKSZ / 1024);
				values[2] = pstrdup(buffer);
				break;
			case GUC_UNIT_COLBLOCKS:
				snprintf(buffer, sizeof(buffer), "%dkB", COL_BLCKSZ / 1024);
				values[2] = pstrdup(buffer);
				break;
			case GUC_UNIT_MS:
				values[2] = "ms";
				break;
			case GUC_UNIT_S:
				values[2] = "s";
				break;
			case GUC_UNIT_MIN:
				values[2] = "min";
				break;
			case 0:
				values[2] = NULL;
				break;
			default:
				elog(ERROR, "unrecognized GUC units value: %d",
					 conf->flags & (GUC_UNIT_MEMORY | GUC_UNIT_TIME));
				values[2] = NULL;
				break;
		}
	}
	else
		values[2] = NULL;

	/* group */
	values[3] = config_group_names[conf->group];

	/* short_desc */
	values[4] = conf->short_desc;

	/* extra_desc */
	values[5] = conf->long_desc;

	/* context */
	values[6] = GucContext_Names[conf->context];

	/* vartype */
	values[7] = config_type_names[conf->vartype];

	/* source */
	values[8] = GucSource_Names[conf->source];

	/* now get the type specific attributes */
	switch (conf->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *lconf = (struct config_bool *) conf;

				/* min_val */
				values[9] = NULL;

				/* max_val */
				values[10] = NULL;

				/* enumvals */
				values[11] = NULL;

				/* boot_val */
				values[12] = pstrdup(lconf->boot_val ? "on" : "off");

				/* reset_val */
				values[13] = pstrdup(lconf->reset_val ? "on" : "off");
			}
			break;

		case PGC_INT:
			{
				struct config_int *lconf = (struct config_int *) conf;

				/* min_val */
				snprintf(buffer, sizeof(buffer), "%d", lconf->min);
				values[9] = pstrdup(buffer);

				/* max_val */
				snprintf(buffer, sizeof(buffer), "%d", lconf->max);
				values[10] = pstrdup(buffer);

				/* enumvals */
				values[11] = NULL;

				/* boot_val */
				snprintf(buffer, sizeof(buffer), "%d", lconf->boot_val);
				values[12] = pstrdup(buffer);

				/* reset_val */
				snprintf(buffer, sizeof(buffer), "%d", lconf->reset_val);
				values[13] = pstrdup(buffer);
			}
			break;

		case PGC_REAL:
			{
				struct config_real *lconf = (struct config_real *) conf;

				/* min_val */
				snprintf(buffer, sizeof(buffer), "%g", lconf->min);
				values[9] = pstrdup(buffer);

				/* max_val */
				snprintf(buffer, sizeof(buffer), "%g", lconf->max);
				values[10] = pstrdup(buffer);

				/* enumvals */
				values[11] = NULL;

				/* boot_val */
				snprintf(buffer, sizeof(buffer), "%g", lconf->boot_val);
				values[12] = pstrdup(buffer);

				/* reset_val */
				snprintf(buffer, sizeof(buffer), "%g", lconf->reset_val);
				values[13] = pstrdup(buffer);
			}
			break;

		case PGC_STRING:
			{
				struct config_string *lconf = (struct config_string *) conf;

				/* min_val */
				values[9] = NULL;

				/* max_val */
				values[10] = NULL;

				/* enumvals */
				values[11] = NULL;

				/* boot_val */
				if (lconf->boot_val == NULL)
					values[12] = NULL;
				else
					values[12] = pstrdup(lconf->boot_val);

				/* reset_val */
				if (lconf->reset_val == NULL)
					values[13] = NULL;
				else
					values[13] = pstrdup(lconf->reset_val);
			}
			break;

		case PGC_ENUM:
			{
				struct config_enum *lconf = (struct config_enum *) conf;

				/* min_val */
				values[9] = NULL;

				/* max_val */
				values[10] = NULL;

				/* enumvals */

				/*
				 * NOTE! enumvals with double quotes in them are not
				 * supported!
				 */
				values[11] = config_enum_get_options((struct config_enum *) conf,
													 "{\"", "\"}", "\",\"");

				/* boot_val */
				values[12] = pstrdup(config_enum_lookup_by_value(lconf,
																 lconf->boot_val));

				/* reset_val */
				values[13] = pstrdup(config_enum_lookup_by_value(lconf,
																 lconf->reset_val));
			}
			break;

		default:
			{
				/*
				 * should never get here, but in case we do, set 'em to NULL
				 */

				/* min_val */
				values[9] = NULL;

				/* max_val */
				values[10] = NULL;

				/* enumvals */
				values[11] = NULL;

				/* boot_val */
				values[12] = NULL;

				/* reset_val */
				values[13] = NULL;
			}
			break;
	}

	/*
	 * If the setting came from a config file, set the source location. For
	 * security reasons, we don't show source file/line number for
	 * non-superusers.
	 */
	if (conf->source == PGC_S_FILE && superuser())
	{
		values[14] = conf->sourcefile;
		snprintf(buffer, sizeof(buffer), "%d", conf->sourceline);
		values[15] = pstrdup(buffer);
	}
	else
	{
		values[14] = NULL;
		values[15] = NULL;
	}

	values[16] = (conf->status & GUC_PENDING_RESTART) ? "t" : "f";
}

/*
 * Return the total number of GUC variables
 */
int
GetNumConfigOptions(void)
{
	return num_guc_variables;
}

/*
 * show_config_by_name - equiv to SHOW X command but implemented as
 * a function.
 */
Datum
show_config_by_name(PG_FUNCTION_ARGS)
{
	char	   *varname = TextDatumGetCString(PG_GETARG_DATUM(0));
	char	   *varval;

	/* Get the value */
	varval = GetConfigOptionByName(varname, NULL, false);

	/* Convert to text */
	PG_RETURN_TEXT_P(cstring_to_text(varval));
}

/*
 * show_config_by_name_missing_ok - equiv to SHOW X command but implemented as
 * a function.  If X does not exist, suppress the error and just return NULL
 * if missing_ok is TRUE.
 */
Datum
show_config_by_name_missing_ok(PG_FUNCTION_ARGS)
{
	char	   *varname = TextDatumGetCString(PG_GETARG_DATUM(0));
	bool		missing_ok = PG_GETARG_BOOL(1);
	char	   *varval;

	/* Get the value */
	varval = GetConfigOptionByName(varname, NULL, missing_ok);

	/* return NULL if no such variable */
	if (varval == NULL)
		PG_RETURN_NULL();

	/* Convert to text */
	PG_RETURN_TEXT_P(cstring_to_text(varval));
}

/*
 * show_all_settings - equiv to SHOW ALL command but implemented as
 * a Table Function.
 */
#define NUM_PG_SETTINGS_ATTS	17

Datum
show_all_settings(PG_FUNCTION_ARGS)
{
	FuncCallContext *funcctx;
	TupleDesc	tupdesc;
	int			call_cntr;
	int			max_calls;
	AttInMetadata *attinmeta;
	MemoryContext oldcontext;

	/* stuff done only on the first call of the function */
	if (SRF_IS_FIRSTCALL())
	{
		/* create a function context for cross-call persistence */
		funcctx = SRF_FIRSTCALL_INIT();

		/*
		 * switch to memory context appropriate for multiple function calls
		 */
		oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);

		/*
		 * need a tuple descriptor representing NUM_PG_SETTINGS_ATTS columns
		 * of the appropriate types
		 */
		tupdesc = CreateTemplateTupleDesc(NUM_PG_SETTINGS_ATTS, false);
		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 3, "unit",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 4, "category",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 5, "short_desc",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 6, "extra_desc",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 7, "context",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 8, "vartype",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 9, "source",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 10, "min_val",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 11, "max_val",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 12, "enumvals",
						   TEXTARRAYOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 13, "boot_val",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 14, "reset_val",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 15, "sourcefile",
						   TEXTOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 16, "sourceline",
						   INT4OID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 17, "pending_restart",
						   BOOLOID, -1, 0);

		/*
		 * Generate attribute metadata needed later to produce tuples from raw
		 * C strings
		 */
		attinmeta = TupleDescGetAttInMetadata(tupdesc);
		funcctx->attinmeta = attinmeta;

		/* total number of tuples to be returned */
		funcctx->max_calls = GetNumConfigOptions();

		MemoryContextSwitchTo(oldcontext);
	}

	/* stuff done on every call of the function */
	funcctx = SRF_PERCALL_SETUP();

	call_cntr = funcctx->call_cntr;
	max_calls = funcctx->max_calls;
	attinmeta = funcctx->attinmeta;

	if (call_cntr < max_calls)	/* do when there is more left to send */
	{
		char	   *values[NUM_PG_SETTINGS_ATTS];
		bool		noshow;
		HeapTuple	tuple;
		Datum		result;

		/*
		 * Get the next visible GUC variable name and value
		 */
		do
		{
			GetConfigOptionByNum(call_cntr, (const char **) values, &noshow);
			if (noshow)
			{
				/* bump the counter and get the next config setting */
				call_cntr = ++funcctx->call_cntr;

				/* make sure we haven't gone too far now */
				if (call_cntr >= max_calls)
					SRF_RETURN_DONE(funcctx);
			}
		} while (noshow);

		/* build a tuple */
		tuple = BuildTupleFromCStrings(attinmeta, values);

		/* make the tuple into a datum */
		result = HeapTupleGetDatum(tuple);

		SRF_RETURN_NEXT(funcctx, result);
	}
	else
	{
		/* do when there is no more left */
		SRF_RETURN_DONE(funcctx);
	}
}

/*
 * show_all_file_settings
 *
 * Returns a table of all parameter settings in all configuration files
 * which includes the config file pathname, the line number, a sequence number
 * indicating the order in which the settings were encountered, the parameter
 * name and value, a bool showing if the value could be applied, and possibly
 * an associated error message.  (For problems such as syntax errors, the
 * parameter name/value might be NULL.)
 *
 * Note: no filtering is done here, instead we depend on the GRANT system
 * to prevent unprivileged users from accessing this function or the view
 * built on top of it.
 */
Datum
show_all_file_settings(PG_FUNCTION_ARGS)
{
#define NUM_PG_FILE_SETTINGS_ATTS 7
	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
	TupleDesc	tupdesc;
	Tuplestorestate *tupstore;
	ConfigVariable *conf;
	int			seqno;
	MemoryContext per_query_ctx;
	MemoryContext oldcontext;

	/* Check to see if caller supports us returning a tuplestore */
	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
		ereport(ERROR,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("set-valued function called in context that cannot accept a set")));
	if (!(rsinfo->allowedModes & SFRM_Materialize))
		ereport(ERROR,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("materialize mode required, but it is not " \
						"allowed in this context")));

	/* Scan the config files using current context as workspace */
	conf = ProcessConfigFileInternal(PGC_SIGHUP, false, DEBUG3);

	/* Switch into long-lived context to construct returned data structures */
	per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
	oldcontext = MemoryContextSwitchTo(per_query_ctx);

	/* Build a tuple descriptor for our result type */
	tupdesc = CreateTemplateTupleDesc(NUM_PG_FILE_SETTINGS_ATTS, false);
	TupleDescInitEntry(tupdesc, (AttrNumber) 1, "sourcefile",
					   TEXTOID, -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 2, "sourceline",
					   INT4OID, -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 3, "seqno",
					   INT4OID, -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 4, "name",
					   TEXTOID, -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 5, "setting",
					   TEXTOID, -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 6, "applied",
					   BOOLOID, -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 7, "error",
					   TEXTOID, -1, 0);

	/* Build a tuplestore to return our results in */
	tupstore = tuplestore_begin_heap(true, false, work_mem);
	rsinfo->returnMode = SFRM_Materialize;
	rsinfo->setResult = tupstore;
	rsinfo->setDesc = tupdesc;

	/* The rest can be done in short-lived context */
	MemoryContextSwitchTo(oldcontext);

	/* Process the results and create a tuplestore */
	for (seqno = 1; conf != NULL; conf = conf->next, seqno++)
	{
		Datum		values[NUM_PG_FILE_SETTINGS_ATTS];
		bool		nulls[NUM_PG_FILE_SETTINGS_ATTS];

		memset(values, 0, sizeof(values));
		memset(nulls, 0, sizeof(nulls));

		/* sourcefile */
		if (conf->filename)
			values[0] = PointerGetDatum(cstring_to_text(conf->filename));
		else
			nulls[0] = true;

		/* sourceline (not meaningful if no sourcefile) */
		if (conf->filename)
			values[1] = Int32GetDatum(conf->sourceline);
		else
			nulls[1] = true;

		/* seqno */
		values[2] = Int32GetDatum(seqno);

		/* name */
		if (conf->name)
			values[3] = PointerGetDatum(cstring_to_text(conf->name));
		else
			nulls[3] = true;

		/* setting */
		if (conf->value)
			values[4] = PointerGetDatum(cstring_to_text(conf->value));
		else
			nulls[4] = true;

		/* applied */
		values[5] = BoolGetDatum(conf->applied);

		/* error */
		if (conf->errmsg)
			values[6] = PointerGetDatum(cstring_to_text(conf->errmsg));
		else
			nulls[6] = true;

		/* shove row into tuplestore */
		tuplestore_putvalues(tupstore, tupdesc, values, nulls);
	}

	tuplestore_donestoring(tupstore);

	return (Datum) 0;
}

char *
getGucVal(struct config_generic *record, bool use_units)
{
	return _ShowOption(record, use_units);
}

static char *
_ShowOption(struct config_generic *record, bool use_units)
{
	char		buffer[256];
	const char *val;

	switch (record->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *conf = (struct config_bool *) record;

				if (conf->show_hook)
					val = conf->show_hook();
				else
					val = *conf->variable ? "on" : "off";
			}
			break;

		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) record;

				if (conf->show_hook)
					val = conf->show_hook();
				else
				{
					/*
					 * Use int64 arithmetic to avoid overflows in units
					 * conversion.
					 */
					int64		result = *conf->variable;
					const char *unit;

					if (use_units && result > 0 && (record->flags & GUC_UNIT))
					{
						convert_from_base_unit(result, record->flags & GUC_UNIT,
											   &result, &unit);
					}
					else
						unit = "";

					snprintf(buffer, sizeof(buffer), INT64_FORMAT "%s",
							 result, unit);
					val = buffer;
				}
			}
			break;

		case PGC_REAL:
			{
				struct config_real *conf = (struct config_real *) record;

				if (conf->show_hook)
					val = conf->show_hook();
				else
				{
					snprintf(buffer, sizeof(buffer), "%g",
							 *conf->variable);
					val = buffer;
				}
			}
			break;

		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) record;

				if (conf->show_hook)
					val = conf->show_hook();
				else if (*conf->variable && **conf->variable)
					val = *conf->variable;
				else
					val = "";
			}
			break;

		case PGC_ENUM:
			{
				struct config_enum *conf = (struct config_enum *) record;

				if (conf->show_hook)
					val = conf->show_hook();
				else
					val = config_enum_lookup_by_value(conf, *conf->variable);
			}
			break;

		default:
			/* just to keep compiler quiet */
			val = "???";
			break;
	}

	return pstrdup(val);
}


#ifdef EXEC_BACKEND

/*
 *	These routines dump out all non-default GUC options into a binary
 *	file that is read by all exec'ed backends.  The format is:
 *
 *		variable name, string, null terminated
 *		variable value, string, null terminated
 *		variable sourcefile, string, null terminated (empty if none)
 *		variable sourceline, integer
 *		variable source, integer
 *		variable scontext, integer
 */
static void
write_one_nondefault_variable(FILE *fp, struct config_generic *gconf)
{
	if (gconf->source == PGC_S_DEFAULT)
		return;

	fprintf(fp, "%s", gconf->name);
	fputc(0, fp);

	switch (gconf->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *conf = (struct config_bool *) gconf;

				if (*conf->variable)
					fprintf(fp, "true");
				else
					fprintf(fp, "false");
			}
			break;

		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) gconf;

				fprintf(fp, "%d", *conf->variable);
			}
			break;

		case PGC_REAL:
			{
				struct config_real *conf = (struct config_real *) gconf;

				fprintf(fp, "%.17g", *conf->variable);
			}
			break;

		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) gconf;

				fprintf(fp, "%s", *conf->variable);
			}
			break;

		case PGC_ENUM:
			{
				struct config_enum *conf = (struct config_enum *) gconf;

				fprintf(fp, "%s",
						config_enum_lookup_by_value(conf, *conf->variable));
			}
			break;
	}

	fputc(0, fp);

	if (gconf->sourcefile)
		fprintf(fp, "%s", gconf->sourcefile);
	fputc(0, fp);

	fwrite(&gconf->sourceline, 1, sizeof(gconf->sourceline), fp);
	fwrite(&gconf->source, 1, sizeof(gconf->source), fp);
	fwrite(&gconf->scontext, 1, sizeof(gconf->scontext), fp);
}

void
write_nondefault_variables(GucContext context)
{
	int			elevel;
	FILE	   *fp;
	int			i;

	Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);

	elevel = (context == PGC_SIGHUP) ? LOG : ERROR;

	/*
	 * Open file
	 */
	fp = AllocateFile(CONFIG_EXEC_PARAMS_NEW, "w");
	if (!fp)
	{
		ereport(elevel,
				(errcode_for_file_access(),
				 errmsg("could not write to file \"%s\": %m",
						CONFIG_EXEC_PARAMS_NEW)));
		return;
	}

	for (i = 0; i < num_guc_variables; i++)
	{
		write_one_nondefault_variable(fp, guc_variables[i]);
	}

	if (FreeFile(fp))
	{
		ereport(elevel,
				(errcode_for_file_access(),
				 errmsg("could not write to file \"%s\": %m",
						CONFIG_EXEC_PARAMS_NEW)));
		return;
	}

	/*
	 * Put new file in place.  This could delay on Win32, but we don't hold
	 * any exclusive locks.
	 */
	rename(CONFIG_EXEC_PARAMS_NEW, CONFIG_EXEC_PARAMS);
}


/*
 *	Read string, including null byte from file
 *
 *	Return NULL on EOF and nothing read
 */
static char *
read_string_with_null(FILE *fp)
{
	int			i = 0,
				ch,
				maxlen = 256;
	char	   *str = NULL;

	do
	{
		if ((ch = fgetc(fp)) == EOF)
		{
			if (i == 0)
				return NULL;
			else
				elog(FATAL, "invalid format of exec config params file");
		}
		if (i == 0)
			str = guc_malloc(FATAL, maxlen);
		else if (i == maxlen)
			str = guc_realloc(FATAL, str, maxlen *= 2);
		str[i++] = ch;
	} while (ch != 0);

	return str;
}


/*
 *	This routine loads a previous postmaster dump of its non-default
 *	settings.
 */
void
read_nondefault_variables(void)
{
	FILE	   *fp;
	char	   *varname,
			   *varvalue,
			   *varsourcefile;
	int			varsourceline;
	GucSource	varsource;
	GucContext	varscontext;

	/*
	 * Assert that PGC_BACKEND/PGC_SU_BACKEND case in set_config_option() will
	 * do the right thing.
	 */
	Assert(IsInitProcessingMode());

	/*
	 * Open file
	 */
	fp = AllocateFile(CONFIG_EXEC_PARAMS, "r");
	if (!fp)
	{
		/* File not found is fine */
		if (errno != ENOENT)
			ereport(FATAL,
					(errcode_for_file_access(),
					 errmsg("could not read from file \"%s\": %m",
							CONFIG_EXEC_PARAMS)));
		return;
	}

	for (;;)
	{
		struct config_generic *record;

		if ((varname = read_string_with_null(fp)) == NULL)
			break;

		if ((record = find_option(varname, true, FATAL)) == NULL)
			elog(FATAL, "failed to locate variable \"%s\" in exec config params file", varname);

		if ((varvalue = read_string_with_null(fp)) == NULL)
			elog(FATAL, "invalid format of exec config params file");
		if ((varsourcefile = read_string_with_null(fp)) == NULL)
			elog(FATAL, "invalid format of exec config params file");
		if (fread(&varsourceline, 1, sizeof(varsourceline), fp) != sizeof(varsourceline))
			elog(FATAL, "invalid format of exec config params file");
		if (fread(&varsource, 1, sizeof(varsource), fp) != sizeof(varsource))
			elog(FATAL, "invalid format of exec config params file");
		if (fread(&varscontext, 1, sizeof(varscontext), fp) != sizeof(varscontext))
			elog(FATAL, "invalid format of exec config params file");

		(void) set_config_option(varname, varvalue,
								 varscontext, varsource,
								 GUC_ACTION_SET, true, 0, true);
		if (varsourcefile[0])
			set_config_sourcefile(varname, varsourcefile, varsourceline);

		free(varname);
		free(varvalue);
		free(varsourcefile);
	}

	FreeFile(fp);
}
#endif							/* EXEC_BACKEND */

/*
 * can_skip_gucvar:
 * When serializing, determine whether to skip this GUC.  When restoring, the
 * negation of this test determines whether to restore the compiled-in default
 * value before processing serialized values.
 *
 * A PGC_S_DEFAULT setting on the serialize side will typically match new
 * postmaster children, but that can be false when got_SIGHUP == true and the
 * pending configuration change modifies this setting.  Nonetheless, we omit
 * PGC_S_DEFAULT settings from serialization and make up for that by restoring
 * defaults before applying serialized values.
 *
 * PGC_POSTMASTER variables always have the same value in every child of a
 * particular postmaster.  Most PGC_INTERNAL variables are compile-time
 * constants; a few, like server_encoding and lc_ctype, are handled specially
 * outside the serialize/restore procedure.  Therefore, SerializeGUCState()
 * never sends these, and RestoreGUCState() never changes them.
 *
 * Role is a special variable in the sense that its current value can be an
 * invalid value and there are multiple ways by which that can happen (like
 * after setting the role, someone drops it).  So we handle it outside of
 * serialize/restore machinery.
 */
static bool
can_skip_gucvar(struct config_generic *gconf)
{
	return gconf->context == PGC_POSTMASTER ||
		gconf->context == PGC_INTERNAL ||
		gconf->source == PGC_S_DEFAULT;
}

/*
 * estimate_variable_size:
 *		Compute space needed for dumping the given GUC variable.
 *
 * It's OK to overestimate, but not to underestimate.
 */
static Size
estimate_variable_size(struct config_generic *gconf)
{
	Size		size;
	Size		valsize = 0;

	if (can_skip_gucvar(gconf))
		return 0;

	/* Name, plus trailing zero byte. */
	size = strlen(gconf->name) + 1;

	/* Get the maximum display length of the GUC value. */
	switch (gconf->vartype)
	{
		case PGC_BOOL:
			{
				valsize = 5;	/* max(strlen('true'), strlen('false')) */
			}
			break;

		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) gconf;

				/*
				 * Instead of getting the exact display length, use max
				 * length.  Also reduce the max length for typical ranges of
				 * small values.  Maximum value is 2147483647, i.e. 10 chars.
				 * Include one byte for sign.
				 */
				if (Abs(*conf->variable) < 1000)
					valsize = 3 + 1;
				else
					valsize = 10 + 1;
			}
			break;

		case PGC_REAL:
			{
				/*
				 * We are going to print it with %e with REALTYPE_PRECISION
				 * fractional digits.  Account for sign, leading digit,
				 * decimal point, and exponent with up to 3 digits.  E.g.
				 * -3.99329042340000021e+110
				 */
				valsize = 1 + 1 + 1 + REALTYPE_PRECISION + 5;
			}
			break;

		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) gconf;

				/*
				 * If the value is NULL, we transmit it as an empty string.
				 * Although this is not physically the same value, GUC
				 * generally treats a NULL the same as empty string.
				 */
				if (*conf->variable)
					valsize = strlen(*conf->variable);
				else
					valsize = 0;
			}
			break;

		case PGC_ENUM:
			{
				struct config_enum *conf = (struct config_enum *) gconf;

				valsize = strlen(config_enum_lookup_by_value(conf, *conf->variable));
			}
			break;
	}

	/* Allow space for terminating zero-byte for value */
	size = add_size(size, valsize + 1);

	if (gconf->sourcefile)
		size = add_size(size, strlen(gconf->sourcefile));

	/* Allow space for terminating zero-byte for sourcefile */
	size = add_size(size, 1);

	/* Include line whenever file is nonempty. */
	if (gconf->sourcefile && gconf->sourcefile[0])
		size = add_size(size, sizeof(gconf->sourceline));

	size = add_size(size, sizeof(gconf->source));
	size = add_size(size, sizeof(gconf->scontext));

	return size;
}

/*
 * EstimateGUCStateSpace:
 * Returns the size needed to store the GUC state for the current process
 */
Size
EstimateGUCStateSpace(void)
{
	Size		size;
	int			i;

	/* Add space reqd for saving the data size of the guc state */
	size = sizeof(Size);

	/* Add up the space needed for each GUC variable */
	for (i = 0; i < num_guc_variables; i++)
		size = add_size(size,
						estimate_variable_size(guc_variables[i]));

	return size;
}

/*
 * do_serialize:
 * Copies the formatted string into the destination.  Moves ahead the
 * destination pointer, and decrements the maxbytes by that many bytes. If
 * maxbytes is not sufficient to copy the string, error out.
 */
static void
do_serialize(char **destptr, Size *maxbytes, const char *fmt,...)
{
	va_list		vargs;
	int			n;

	if (*maxbytes <= 0)
		elog(ERROR, "not enough space to serialize GUC state");

	va_start(vargs, fmt);
	n = vsnprintf(*destptr, *maxbytes, fmt, vargs);
	va_end(vargs);

	/*
	 * Cater to portability hazards in the vsnprintf() return value just like
	 * appendPQExpBufferVA() does.  Note that this requires an extra byte of
	 * slack at the end of the buffer.  Since serialize_variable() ends with a
	 * do_serialize_binary() rather than a do_serialize(), we'll always have
	 * that slack; estimate_variable_size() need not add a byte for it.
	 */
	if (n < 0 || n >= *maxbytes - 1)
	{
		if (n < 0 && errno != 0 && errno != ENOMEM)
			/* Shouldn't happen. Better show errno description. */
			elog(ERROR, "vsnprintf failed: %m");
		else
			elog(ERROR, "not enough space to serialize GUC state");
	}

	/* Shift the destptr ahead of the null terminator */
	*destptr += n + 1;
	*maxbytes -= n + 1;
}

/* Binary copy version of do_serialize() */
static void
do_serialize_binary(char **destptr, Size *maxbytes, void *val, Size valsize)
{
	if (valsize > *maxbytes)
		elog(ERROR, "not enough space to serialize GUC state");

	memcpy(*destptr, val, valsize);
	*destptr += valsize;
	*maxbytes -= valsize;
}

/*
 * serialize_variable:
 * Dumps name, value and other information of a GUC variable into destptr.
 */
static void
serialize_variable(char **destptr, Size *maxbytes,
				   struct config_generic *gconf)
{
	if (can_skip_gucvar(gconf))
		return;

	do_serialize(destptr, maxbytes, "%s", gconf->name);

	switch (gconf->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *conf = (struct config_bool *) gconf;

				do_serialize(destptr, maxbytes,
							 (*conf->variable ? "true" : "false"));
			}
			break;

		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) gconf;

				do_serialize(destptr, maxbytes, "%d", *conf->variable);
			}
			break;

		case PGC_REAL:
			{
				struct config_real *conf = (struct config_real *) gconf;

				do_serialize(destptr, maxbytes, "%.*e",
							 REALTYPE_PRECISION, *conf->variable);
			}
			break;

		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) gconf;

				/* NULL becomes empty string, see estimate_variable_size() */
				do_serialize(destptr, maxbytes, "%s",
							 *conf->variable ? *conf->variable : "");
			}
			break;

		case PGC_ENUM:
			{
				struct config_enum *conf = (struct config_enum *) gconf;

				do_serialize(destptr, maxbytes, "%s",
							 config_enum_lookup_by_value(conf, *conf->variable));
			}
			break;
	}

	do_serialize(destptr, maxbytes, "%s",
				 (gconf->sourcefile ? gconf->sourcefile : ""));

	if (gconf->sourcefile && gconf->sourcefile[0])
		do_serialize_binary(destptr, maxbytes, &gconf->sourceline,
							sizeof(gconf->sourceline));

	do_serialize_binary(destptr, maxbytes, &gconf->source,
						sizeof(gconf->source));
	do_serialize_binary(destptr, maxbytes, &gconf->scontext,
						sizeof(gconf->scontext));
}

/*
 * SerializeGUCState:
 * Dumps the complete GUC state onto the memory location at start_address.
 */
void
SerializeGUCState(Size maxsize, char *start_address)
{
	char	   *curptr;
	Size		actual_size;
	Size		bytes_left;
	int			i;

	/* Reserve space for saving the actual size of the guc state */
	Assert(maxsize > sizeof(actual_size));
	curptr = start_address + sizeof(actual_size);
	bytes_left = maxsize - sizeof(actual_size);

	for (i = 0; i < num_guc_variables; i++)
		serialize_variable(&curptr, &bytes_left, guc_variables[i]);

	/* Store actual size without assuming alignment of start_address. */
	actual_size = maxsize - bytes_left - sizeof(actual_size);
	memcpy(start_address, &actual_size, sizeof(actual_size));
}

/*
 * read_gucstate:
 * Actually it does not read anything, just returns the srcptr. But it does
 * move the srcptr past the terminating zero byte, so that the caller is ready
 * to read the next string.
 */
static char *
read_gucstate(char **srcptr, char *srcend)
{
	char	   *retptr = *srcptr;
	char	   *ptr;

	if (*srcptr >= srcend)
		elog(ERROR, "incomplete GUC state");

	/* The string variables are all null terminated */
	for (ptr = *srcptr; ptr < srcend && *ptr != '\0'; ptr++)
		;

	if (ptr >= srcend)
		elog(ERROR, "could not find null terminator in GUC state");

	/* Set the new position to the byte following the terminating NUL */
	*srcptr = ptr + 1;

	return retptr;
}

/* Binary read version of read_gucstate(). Copies into dest */
static void
read_gucstate_binary(char **srcptr, char *srcend, void *dest, Size size)
{
	if (*srcptr + size > srcend)
		elog(ERROR, "incomplete GUC state");

	memcpy(dest, *srcptr, size);
	*srcptr += size;
}

/*
 * RestoreGUCState:
 * Reads the GUC state at the specified address and updates the GUCs with the
 * values read from the GUC state.
 */
void
RestoreGUCState(void *gucstate)
{
	char	   *varname,
			   *varvalue,
			   *varsourcefile;
	int			varsourceline = 0;
	GucSource	varsource;
	GucContext	varscontext;
	char	   *srcptr = (char *) gucstate;
	char	   *srcend;
	Size		len;
	int			i;

	/* See comment at can_skip_gucvar(). */
	for (i = 0; i < num_guc_variables; i++)
		if (!can_skip_gucvar(guc_variables[i]))
			InitializeOneGUCOption(guc_variables[i]);

	/* First item is the length of the subsequent data */
	memcpy(&len, gucstate, sizeof(len));

	srcptr += sizeof(len);
	srcend = srcptr + len;

	while (srcptr < srcend)
	{
		int			result;

		varname = read_gucstate(&srcptr, srcend);
		varvalue = read_gucstate(&srcptr, srcend);
		varsourcefile = read_gucstate(&srcptr, srcend);
		if (varsourcefile[0])
			read_gucstate_binary(&srcptr, srcend,
								 &varsourceline, sizeof(varsourceline));
		read_gucstate_binary(&srcptr, srcend,
							 &varsource, sizeof(varsource));
		read_gucstate_binary(&srcptr, srcend,
							 &varscontext, sizeof(varscontext));

		result = set_config_option(varname, varvalue, varscontext, varsource,
								   GUC_ACTION_SET, true, ERROR, true);
		if (result <= 0)
			ereport(ERROR,
					(errcode(ERRCODE_INTERNAL_ERROR),
					 errmsg("parameter \"%s\" could not be set", varname)));
		if (varsourcefile[0])
			set_config_sourcefile(varname, varsourcefile, varsourceline);
	}
}

/*
 * A little "long argument" simulation, although not quite GNU
 * compliant. Takes a string of the form "some-option=some value" and
 * returns name = "some_option" and value = "some value" in malloc'ed
 * storage. Note that '-' is converted to '_' in the option name. If
 * there is no '=' in the input string then value will be NULL.
 */
void
ParseLongOption(const char *string, char **name, char **value)
{
	size_t		equal_pos;
	char	   *cp;

	AssertArg(string);
	AssertArg(name);
	AssertArg(value);

	equal_pos = strcspn(string, "=");

	if (string[equal_pos] == '=')
	{
		*name = guc_malloc(FATAL, equal_pos + 1);
		strlcpy(*name, string, equal_pos + 1);

		*value = guc_strdup(FATAL, &string[equal_pos + 1]);
	}
	else
	{
		/* no equal sign in string */
		*name = guc_strdup(FATAL, string);
		*value = NULL;
	}

	for (cp = *name; *cp; cp++)
		if (*cp == '-')
			*cp = '_';
}


/*
 * Handle options fetched from pg_db_role_setting.setconfig,
 * pg_proc.proconfig, etc.  Caller must specify proper context/source/action.
 *
 * The array parameter must be an array of TEXT (it must not be NULL).
 */
void
ProcessGUCArray(ArrayType *array,
				GucContext context, GucSource source, GucAction action)
{
	int			i;

	Assert(array != NULL);
	Assert(ARR_ELEMTYPE(array) == TEXTOID);
	Assert(ARR_NDIM(array) == 1);
	Assert(ARR_LBOUND(array)[0] == 1);

	for (i = 1; i <= ARR_DIMS(array)[0]; i++)
	{
		Datum		d;
		bool		isnull;
		char	   *s;
		char	   *name;
		char	   *value;

		d = array_ref(array, 1, &i,
					  -1 /* varlenarray */ ,
					  -1 /* TEXT's typlen */ ,
					  false /* TEXT's typbyval */ ,
					  'i' /* TEXT's typalign */ ,
					  &isnull);

		if (isnull)
			continue;

		s = TextDatumGetCString(d);

		ParseLongOption(s, &name, &value);
		if (!value)
		{
			ereport(WARNING,
					(errcode(ERRCODE_SYNTAX_ERROR),
					 errmsg("could not parse setting for parameter \"%s\"",
							name)));
			free(name);
			continue;
		}

		(void) set_config_option(name, value,
								 context, source,
								 action, true, 0, false);

		free(name);
		if (value)
			free(value);
		pfree(s);
	}
}


/*
 * Add an entry to an option array.  The array parameter may be NULL
 * to indicate the current table entry is NULL.
 */
ArrayType *
GUCArrayAdd(ArrayType *array, const char *name, const char *value)
{
	struct config_generic *record;
	Datum		datum;
	char	   *newval;
	ArrayType  *a;

	Assert(name);
	Assert(value);

	/* test if the option is valid and we're allowed to set it */
	(void) validate_option_array_item(name, value, false);

	/* normalize name (converts obsolete GUC names to modern spellings) */
	record = find_option(name, false, WARNING);
	if (record)
		name = record->name;

	/* build new item for array */
	newval = psprintf("%s=%s", name, value);
	datum = CStringGetTextDatum(newval);

	if (array)
	{
		int			index;
		bool		isnull;
		int			i;

		Assert(ARR_ELEMTYPE(array) == TEXTOID);
		Assert(ARR_NDIM(array) == 1);
		Assert(ARR_LBOUND(array)[0] == 1);

		index = ARR_DIMS(array)[0] + 1; /* add after end */

		for (i = 1; i <= ARR_DIMS(array)[0]; i++)
		{
			Datum		d;
			char	   *current;

			d = array_ref(array, 1, &i,
						  -1 /* varlenarray */ ,
						  -1 /* TEXT's typlen */ ,
						  false /* TEXT's typbyval */ ,
						  'i' /* TEXT's typalign */ ,
						  &isnull);
			if (isnull)
				continue;
			current = TextDatumGetCString(d);

			/* check for match up through and including '=' */
			if (strncmp(current, newval, strlen(name) + 1) == 0)
			{
				index = i;
				break;
			}
		}

		a = array_set(array, 1, &index,
					  datum,
					  false,
					  -1 /* varlena array */ ,
					  -1 /* TEXT's typlen */ ,
					  false /* TEXT's typbyval */ ,
					  'i' /* TEXT's typalign */ );
	}
	else
		a = construct_array(&datum, 1,
							TEXTOID,
							-1, false, 'i');

	return a;
}


/*
 * Delete an entry from an option array.  The array parameter may be NULL
 * to indicate the current table entry is NULL.  Also, if the return value
 * is NULL then a null should be stored.
 */
ArrayType *
GUCArrayDelete(ArrayType *array, const char *name)
{
	struct config_generic *record;
	ArrayType  *newarray;
	int			i;
	int			index;

	Assert(name);

	/* test if the option is valid and we're allowed to set it */
	(void) validate_option_array_item(name, NULL, false);

	/* normalize name (converts obsolete GUC names to modern spellings) */
	record = find_option(name, false, WARNING);
	if (record)
		name = record->name;

	/* if array is currently null, then surely nothing to delete */
	if (!array)
		return NULL;

	newarray = NULL;
	index = 1;

	for (i = 1; i <= ARR_DIMS(array)[0]; i++)
	{
		Datum		d;
		char	   *val;
		bool		isnull;

		d = array_ref(array, 1, &i,
					  -1 /* varlenarray */ ,
					  -1 /* TEXT's typlen */ ,
					  false /* TEXT's typbyval */ ,
					  'i' /* TEXT's typalign */ ,
					  &isnull);
		if (isnull)
			continue;
		val = TextDatumGetCString(d);

		/* ignore entry if it's what we want to delete */
		if (strncmp(val, name, strlen(name)) == 0
			&& val[strlen(name)] == '=')
			continue;

		/* else add it to the output array */
		if (newarray)
			newarray = array_set(newarray, 1, &index,
								 d,
								 false,
								 -1 /* varlenarray */ ,
								 -1 /* TEXT's typlen */ ,
								 false /* TEXT's typbyval */ ,
								 'i' /* TEXT's typalign */ );
		else
			newarray = construct_array(&d, 1,
									   TEXTOID,
									   -1, false, 'i');

		index++;
	}

	return newarray;
}


/*
 * Given a GUC array, delete all settings from it that our permission
 * level allows: if superuser, delete them all; if regular user, only
 * those that are PGC_USERSET
 */
ArrayType *
GUCArrayReset(ArrayType *array)
{
	ArrayType  *newarray;
	int			i;
	int			index;

	/* if array is currently null, nothing to do */
	if (!array)
		return NULL;

	/* if we're superuser, we can delete everything, so just do it */
	if (superuser())
		return NULL;

	newarray = NULL;
	index = 1;

	for (i = 1; i <= ARR_DIMS(array)[0]; i++)
	{
		Datum		d;
		char	   *val;
		char	   *eqsgn;
		bool		isnull;

		d = array_ref(array, 1, &i,
					  -1 /* varlenarray */ ,
					  -1 /* TEXT's typlen */ ,
					  false /* TEXT's typbyval */ ,
					  'i' /* TEXT's typalign */ ,
					  &isnull);
		if (isnull)
			continue;
		val = TextDatumGetCString(d);

		eqsgn = strchr(val, '=');
		*eqsgn = '\0';

		/* skip if we have permission to delete it */
		if (validate_option_array_item(val, NULL, true))
			continue;

		/* else add it to the output array */
		if (newarray)
			newarray = array_set(newarray, 1, &index,
								 d,
								 false,
								 -1 /* varlenarray */ ,
								 -1 /* TEXT's typlen */ ,
								 false /* TEXT's typbyval */ ,
								 'i' /* TEXT's typalign */ );
		else
			newarray = construct_array(&d, 1,
									   TEXTOID,
									   -1, false, 'i');

		index++;
		pfree(val);
	}

	return newarray;
}

/*
 * Validate a proposed option setting for GUCArrayAdd/Delete/Reset.
 *
 * name is the option name.  value is the proposed value for the Add case,
 * or NULL for the Delete/Reset cases.  If skipIfNoPermissions is true, it's
 * not an error to have no permissions to set the option.
 *
 * Returns TRUE if OK, FALSE if skipIfNoPermissions is true and user does not
 * have permission to change this option (all other error cases result in an
 * error being thrown).
 */
static bool
validate_option_array_item(const char *name, const char *value,
						   bool skipIfNoPermissions)

{
	struct config_generic *gconf;

	/*
	 * There are three cases to consider:
	 *
	 * name is a known GUC variable.  Check the value normally, check
	 * permissions normally (i.e., allow if variable is USERSET, or if it's
	 * SUSET and user is superuser).
	 *
	 * name is not known, but exists or can be created as a placeholder (i.e.,
	 * it has a prefixed name).  We allow this case if you're a superuser,
	 * otherwise not.  Superusers are assumed to know what they're doing. We
	 * can't allow it for other users, because when the placeholder is
	 * resolved it might turn out to be a SUSET variable;
	 * define_custom_variable assumes we checked that.
	 *
	 * name is not known and can't be created as a placeholder.  Throw error,
	 * unless skipIfNoPermissions is true, in which case return FALSE.
	 */
	gconf = find_option(name, true, WARNING);
	if (!gconf)
	{
		/* not known, failed to make a placeholder */
		if (skipIfNoPermissions)
			return false;
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
				 errmsg("unrecognized configuration parameter \"%s\"",
						name)));
	}

	if (gconf->flags & GUC_CUSTOM_PLACEHOLDER)
	{
		/*
		 * We cannot do any meaningful check on the value, so only permissions
		 * are useful to check.
		 */
		if (superuser())
			return true;
		if (skipIfNoPermissions)
			return false;
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("permission denied to set parameter \"%s\"", name)));
	}

	/* manual permissions check so we can avoid an error being thrown */
	if (gconf->context == PGC_USERSET)
		 /* ok */ ;
	else if (gconf->context == PGC_SUSET && superuser())
		 /* ok */ ;
	else if (skipIfNoPermissions)
		return false;
	/* if a permissions error should be thrown, let set_config_option do it */

	/* test for permissions and valid option value */
	(void) set_config_option(name, value,
							 superuser() ? PGC_SUSET : PGC_USERSET,
							 PGC_S_TEST, GUC_ACTION_SET, false, 0, false);

	return true;
}


/*
 * Called by check_hooks that want to override the normal
 * ERRCODE_INVALID_PARAMETER_VALUE SQLSTATE for check hook failures.
 *
 * Note that GUC_check_errmsg() etc are just macros that result in a direct
 * assignment to the associated variables.  That is ugly, but forced by the
 * limitations of C's macro mechanisms.
 */
void
GUC_check_errcode(int sqlerrcode)
{
	GUC_check_errcode_value = sqlerrcode;
}


/*
 * Convenience functions to manage calling a variable's check_hook.
 * These mostly take care of the protocol for letting check hooks supply
 * portions of the error report on failure.
 */

static bool
call_bool_check_hook(struct config_bool *conf, bool *newval, void **extra,
					 GucSource source, int elevel)
{
	/* Quick success if no hook */
	if (!conf->check_hook)
		return true;

	/* Reset variables that might be set by hook */
	GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
	GUC_check_errmsg_string = NULL;
	GUC_check_errdetail_string = NULL;
	GUC_check_errhint_string = NULL;

	if (!conf->check_hook(newval, extra, source))
	{
		ereport(elevel,
				(errcode(GUC_check_errcode_value),
				 GUC_check_errmsg_string ?
				 errmsg_internal("%s", GUC_check_errmsg_string) :
				 errmsg("invalid value for parameter \"%s\": %d",
						conf->gen.name, (int) *newval),
				 GUC_check_errdetail_string ?
				 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
				 GUC_check_errhint_string ?
				 errhint("%s", GUC_check_errhint_string) : 0));
		/* Flush any strings created in ErrorContext */
		FlushErrorState();
		return false;
	}

	return true;
}

static bool
call_int_check_hook(struct config_int *conf, int *newval, void **extra,
					GucSource source, int elevel)
{
	/* Quick success if no hook */
	if (!conf->check_hook)
		return true;

	/* Reset variables that might be set by hook */
	GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
	GUC_check_errmsg_string = NULL;
	GUC_check_errdetail_string = NULL;
	GUC_check_errhint_string = NULL;

	if (!conf->check_hook(newval, extra, source))
	{
		ereport(elevel,
				(errcode(GUC_check_errcode_value),
				 GUC_check_errmsg_string ?
				 errmsg_internal("%s", GUC_check_errmsg_string) :
				 errmsg("invalid value for parameter \"%s\": %d",
						conf->gen.name, *newval),
				 GUC_check_errdetail_string ?
				 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
				 GUC_check_errhint_string ?
				 errhint("%s", GUC_check_errhint_string) : 0));
		/* Flush any strings created in ErrorContext */
		FlushErrorState();
		return false;
	}

	return true;
}

static bool
call_real_check_hook(struct config_real *conf, double *newval, void **extra,
					 GucSource source, int elevel)
{
	/* Quick success if no hook */
	if (!conf->check_hook)
		return true;

	/* Reset variables that might be set by hook */
	GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
	GUC_check_errmsg_string = NULL;
	GUC_check_errdetail_string = NULL;
	GUC_check_errhint_string = NULL;

	if (!conf->check_hook(newval, extra, source))
	{
		ereport(elevel,
				(errcode(GUC_check_errcode_value),
				 GUC_check_errmsg_string ?
				 errmsg_internal("%s", GUC_check_errmsg_string) :
				 errmsg("invalid value for parameter \"%s\": %g",
						conf->gen.name, *newval),
				 GUC_check_errdetail_string ?
				 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
				 GUC_check_errhint_string ?
				 errhint("%s", GUC_check_errhint_string) : 0));
		/* Flush any strings created in ErrorContext */
		FlushErrorState();
		return false;
	}

	return true;
}

static bool
call_string_check_hook(struct config_string *conf, char **newval, void **extra,
					   GucSource source, int elevel)
{
	/* Quick success if no hook */
	if (!conf->check_hook)
		return true;

	/* Reset variables that might be set by hook */
	GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
	GUC_check_errmsg_string = NULL;
	GUC_check_errdetail_string = NULL;
	GUC_check_errhint_string = NULL;

	if (!conf->check_hook(newval, extra, source))
	{
		ereport(elevel,
				(errcode(GUC_check_errcode_value),
				 GUC_check_errmsg_string ?
				 errmsg_internal("%s", GUC_check_errmsg_string) :
				 errmsg("invalid value for parameter \"%s\": \"%s\"",
						conf->gen.name, *newval ? *newval : ""),
				 GUC_check_errdetail_string ?
				 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
				 GUC_check_errhint_string ?
				 errhint("%s", GUC_check_errhint_string) : 0));
		/* Flush any strings created in ErrorContext */
		FlushErrorState();
		return false;
	}

	return true;
}

static bool
call_enum_check_hook(struct config_enum *conf, int *newval, void **extra,
					 GucSource source, int elevel)
{
	/* Quick success if no hook */
	if (!conf->check_hook)
		return true;

	/* Reset variables that might be set by hook */
	GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
	GUC_check_errmsg_string = NULL;
	GUC_check_errdetail_string = NULL;
	GUC_check_errhint_string = NULL;

	if (!conf->check_hook(newval, extra, source))
	{
		ereport(elevel,
				(errcode(GUC_check_errcode_value),
				 GUC_check_errmsg_string ?
				 errmsg_internal("%s", GUC_check_errmsg_string) :
				 errmsg("invalid value for parameter \"%s\": \"%s\"",
						conf->gen.name,
						config_enum_lookup_by_value(conf, *newval)),
				 GUC_check_errdetail_string ?
				 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
				 GUC_check_errhint_string ?
				 errhint("%s", GUC_check_errhint_string) : 0));
		/* Flush any strings created in ErrorContext */
		FlushErrorState();
		return false;
	}

	return true;
}


/*
 * check_hook, assign_hook and show_hook subroutines
 */

static bool
check_wal_consistency_checking(char **newval, void **extra, GucSource source)
{
	char	   *rawstring;
	List	   *elemlist;
	ListCell   *l;
	bool		newwalconsistency[RM_MAX_ID + 1];

	/* Initialize the array */
	MemSet(newwalconsistency, 0, (RM_MAX_ID + 1) * sizeof(bool));

	/* Need a modifiable copy of string */
	rawstring = pstrdup(*newval);

	/* Parse string into list of identifiers */
	if (!SplitIdentifierString(rawstring, ',', &elemlist))
	{
		/* syntax error in list */
		GUC_check_errdetail("List syntax is invalid.");
		pfree(rawstring);
		list_free(elemlist);
		return false;
	}

	foreach(l, elemlist)
	{
		char	   *tok = (char *) lfirst(l);
		bool		found = false;
		RmgrId		rmid;

		/* Check for 'all'. */
		if (pg_strcasecmp(tok, "all") == 0)
		{
			for (rmid = 0; rmid <= RM_MAX_ID; rmid++)
				if (RmgrTable[rmid].rm_mask != NULL)
					newwalconsistency[rmid] = true;
			found = true;
		}
		else
		{
			/*
			 * Check if the token matches with any individual resource
			 * manager.
			 */
			for (rmid = 0; rmid <= RM_MAX_ID; rmid++)
			{
				if (pg_strcasecmp(tok, RmgrTable[rmid].rm_name) == 0 &&
					RmgrTable[rmid].rm_mask != NULL)
				{
					newwalconsistency[rmid] = true;
					found = true;
				}
			}
		}

		/* If a valid resource manager is found, check for the next one. */
		if (!found)
		{
			GUC_check_errdetail("Unrecognized key word: \"%s\".", tok);
			pfree(rawstring);
			list_free(elemlist);
			return false;
		}
	}

	pfree(rawstring);
	list_free(elemlist);

	/* assign new value */
	*extra = guc_malloc(ERROR, (RM_MAX_ID + 1) * sizeof(bool));
	memcpy(*extra, newwalconsistency, (RM_MAX_ID + 1) * sizeof(bool));
	return true;
}

static void
assign_wal_consistency_checking(const char *newval, void *extra)
{
	wal_consistency_checking = (bool *) extra;
}

static bool
check_log_destination(char **newval, void **extra, GucSource source)
{
	char	   *rawstring;
	List	   *elemlist;
	ListCell   *l;
	int			newlogdest = 0;
	int		   *myextra;

	/* Need a modifiable copy of string */
	rawstring = pstrdup(*newval);

	/* Parse string into list of identifiers */
	if (!SplitIdentifierString(rawstring, ',', &elemlist))
	{
		/* syntax error in list */
		GUC_check_errdetail("List syntax is invalid.");
		pfree(rawstring);
		list_free(elemlist);
		return false;
	}

	foreach(l, elemlist)
	{
		char	   *tok = (char *) lfirst(l);

		if (pg_strcasecmp(tok, "stderr") == 0)
			newlogdest |= LOG_DESTINATION_STDERR;
		else if (pg_strcasecmp(tok, "csvlog") == 0)
			newlogdest |= LOG_DESTINATION_CSVLOG;
#ifdef HAVE_SYSLOG
		else if (pg_strcasecmp(tok, "syslog") == 0)
			newlogdest |= LOG_DESTINATION_SYSLOG;
#endif
#ifdef WIN32
		else if (pg_strcasecmp(tok, "eventlog") == 0)
			newlogdest |= LOG_DESTINATION_EVENTLOG;
#endif
		else
		{
			GUC_check_errdetail("Unrecognized key word: \"%s\".", tok);
			pfree(rawstring);
			list_free(elemlist);
			return false;
		}
	}

	pfree(rawstring);
	list_free(elemlist);

	myextra = (int *) guc_malloc(ERROR, sizeof(int));
	*myextra = newlogdest;
	*extra = (void *) myextra;

	return true;
}

static void
assign_log_destination(const char *newval, void *extra)
{
	Log_destination = *((int *) extra);
}

static void
assign_syslog_facility(int newval, void *extra)
{
#ifdef HAVE_SYSLOG
	set_syslog_parameters(syslog_ident_str ? syslog_ident_str : "postgres",
						  newval);
#endif
	/* Without syslog support, just ignore it */
}

static void
assign_syslog_ident(const char *newval, void *extra)
{
#ifdef HAVE_SYSLOG
	set_syslog_parameters(newval, syslog_facility);
#endif
	/* Without syslog support, it will always be set to "none", so ignore */
}


static void
assign_session_replication_role(int newval, void *extra)
{
	/*
	 * Must flush the plan cache when changing replication role; but don't
	 * flush unnecessarily.
	 */
	if (SessionReplicationRole != newval)
		ResetPlanCache();
}

static bool
check_temp_buffers(int *newval, void **extra, GucSource source)
{
	/*
	 * Once local buffers have been initialized, it's too late to change this.
	 */
	if (NLocBuffer && NLocBuffer != *newval)
	{
		GUC_check_errdetail("\"temp_buffers\" cannot be changed after any temporary tables have been accessed in the session.");
		return false;
	}
	return true;
}

static bool
check_bonjour(bool *newval, void **extra, GucSource source)
{
#ifndef USE_BONJOUR
	if (*newval)
	{
		GUC_check_errmsg("Bonjour is not supported by this build");
		return false;
	}
#endif
	return true;
}

static bool
check_ssl(bool *newval, void **extra, GucSource source)
{
#ifndef USE_SSL
	if (*newval)
	{
		GUC_check_errmsg("SSL is not supported by this build");
		return false;
	}
#endif
	return true;
}

static bool
check_stage_log_stats(bool *newval, void **extra, GucSource source)
{
	if (*newval && log_statement_stats)
	{
		GUC_check_errdetail("Cannot enable parameter when \"log_statement_stats\" is true.");
		return false;
	}
	return true;
}

static bool
check_log_stats(bool *newval, void **extra, GucSource source)
{
	if (*newval &&
		(log_parser_stats || log_planner_stats || log_executor_stats))
	{
		GUC_check_errdetail("Cannot enable \"log_statement_stats\" when "
							"\"log_parser_stats\", \"log_planner_stats\", "
							"or \"log_executor_stats\" is true.");
		return false;
	}
	return true;
}


#ifdef PGXC
/*
 * Only a warning is printed to log.
 * Returning false will cause FATAL error and it will not be good.
 */
static bool
check_pgxc_maintenance_mode(bool *newval, void **extra, GucSource source)
{

	switch(source)
	{
		case PGC_S_DYNAMIC_DEFAULT:
		case PGC_S_ENV_VAR:
		case PGC_S_ARGV:
			GUC_check_errmsg("pgxc_maintenance_mode is not allowed here.");
			return false;
		case PGC_S_FILE:
			switch (currentGucContext)
			{
				case PGC_SIGHUP:
					elog(WARNING, "pgxc_maintenance_mode is not allowed in  postgresql.conf.  Set to default (false).");
					*newval = false;
					return true;
				default:
					GUC_check_errmsg("pgxc_maintenance_mode is not allowed in postgresql.conf.");
					return false;
			}
			return false;	/* Should not come here */
		case PGC_S_DATABASE:
		case PGC_S_USER:
		case PGC_S_DATABASE_USER:
		case PGC_S_INTERACTIVE:
		case PGC_S_TEST:
			elog(WARNING, "pgxc_maintenance_mode is not allowed here.  Set to default (false).");
			*newval = false;
			return true;
		case PGC_S_DEFAULT:
		case PGC_S_CLIENT:
		case PGC_S_SESSION:
			return true;
		default:
			GUC_check_errmsg("Unknown source");
			return false;
	}
}
#endif

static bool
check_centralized_mode(bool *newval, void **extra, GucSource source)
{

	if (*newval && IS_PGXC_COORDINATOR)
	{
		GUC_check_errmsg("is_centralized_mode is not allowed for coordinator.");
		return false;
	}

	return true;
}

static bool
check_canonical_path(char **newval, void **extra, GucSource source)
{
	/*
	 * Since canonicalize_path never enlarges the string, we can just modify
	 * newval in-place.  But watch out for NULL, which is the default value
	 * for external_pid_file.
	 */
	if (*newval)
		canonicalize_path(*newval);
	return true;
}

static bool
check_timezone_abbreviations(char **newval, void **extra, GucSource source)
{
	/*
	 * The boot_val given above for timezone_abbreviations is NULL. When we
	 * see this we just do nothing.  If this value isn't overridden from the
	 * config file then pg_timezone_abbrev_initialize() will eventually
	 * replace it with "Default".  This hack has two purposes: to avoid
	 * wasting cycles loading values that might soon be overridden from the
	 * config file, and to avoid trying to read the timezone abbrev files
	 * during InitializeGUCOptions().  The latter doesn't work in an
	 * EXEC_BACKEND subprocess because my_exec_path hasn't been set yet and so
	 * we can't locate PGSHAREDIR.
	 */
	if (*newval == NULL)
	{
		Assert(source == PGC_S_DEFAULT);
		return true;
	}

	/* OK, load the file and produce a malloc'd TimeZoneAbbrevTable */
	*extra = load_tzoffsets(*newval);

	/* tzparser.c returns NULL on failure, reporting via GUC_check_errmsg */
	if (!*extra)
		return false;

	return true;
}

static void
assign_timezone_abbreviations(const char *newval, void *extra)
{
	/* Do nothing for the boot_val default of NULL */
	if (!extra)
		return;

	InstallTimeZoneAbbrevs((TimeZoneAbbrevTable *) extra);
}

/*
 * pg_timezone_abbrev_initialize --- set default value if not done already
 *
 * This is called after initial loading of postgresql.conf.  If no
 * timezone_abbreviations setting was found therein, select default.
 * If a non-default value is already installed, nothing will happen.
 *
 * This can also be called from ProcessConfigFile to establish the default
 * value after a postgresql.conf entry for it is removed.
 */
static void
pg_timezone_abbrev_initialize(void)
{
	SetConfigOption("timezone_abbreviations", "Default",
					PGC_POSTMASTER, PGC_S_DYNAMIC_DEFAULT);
}

static const char *
show_archive_command(void)
{
	if (XLogArchivingActive())
		return XLogArchiveCommand;
	else
		return "(disabled)";
}

static void
assign_tcp_keepalives_idle(int newval, void *extra)
{
	/*
	 * The kernel API provides no way to test a value without setting it; and
	 * once we set it we might fail to unset it.  So there seems little point
	 * in fully implementing the check-then-assign GUC API for these
	 * variables.  Instead we just do the assignment on demand.  pqcomm.c
	 * reports any problems via elog(LOG).
	 *
	 * This approach means that the GUC value might have little to do with the
	 * actual kernel value, so we use a show_hook that retrieves the kernel
	 * value rather than trusting GUC's copy.
	 */
	(void) pq_setkeepalivesidle(newval, MyProcPort);
}

static const char *
show_tcp_keepalives_idle(void)
{
	/* See comments in assign_tcp_keepalives_idle */
	static char nbuf[16];

	snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesidle(MyProcPort));
	return nbuf;
}

static void
assign_tcp_keepalives_interval(int newval, void *extra)
{
	/* See comments in assign_tcp_keepalives_idle */
	(void) pq_setkeepalivesinterval(newval, MyProcPort);
}

static const char *
show_tcp_keepalives_interval(void)
{
	/* See comments in assign_tcp_keepalives_idle */
	static char nbuf[16];

	snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesinterval(MyProcPort));
	return nbuf;
}

static void
assign_tcp_keepalives_count(int newval, void *extra)
{
	/* See comments in assign_tcp_keepalives_idle */
	(void) pq_setkeepalivescount(newval, MyProcPort);
}

static const char *
show_tcp_keepalives_count(void)
{
	/* See comments in assign_tcp_keepalives_idle */
	static char nbuf[16];

	snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivescount(MyProcPort));
	return nbuf;
}

static void
assign_tcp_user_timeout(int newval, void *extra)
{
	/* See comments in assign_tcp_keepalives_idle */
	(void) pq_settcpusertimeout(newval, MyProcPort);
}

static const char *
show_tcp_user_timeout(void)
{
	/* See comments in assign_tcp_keepalives_idle */
	static char nbuf[16];

	snprintf(nbuf, sizeof(nbuf), "%d", pq_gettcpusertimeout(MyProcPort));
	return nbuf;
}

static bool
check_maxconnections(int *newval, void **extra, GucSource source)
{
	if (*newval + autovacuum_max_workers + 1 +
		pgjob_max_workers + 1 +
		max_worker_processes > MAX_BACKENDS)
		return false;
	return true;
}

static bool
check_autovacuum_max_workers(int *newval, void **extra, GucSource source)
{
	if (MaxConnections + *newval + 1 + max_worker_processes > MAX_BACKENDS)
		return false;
	return true;
}


static bool
check_autovacuum_work_mem(int *newval, void **extra, GucSource source)
{
	/*
	 * -1 indicates fallback.
	 *
	 * If we haven't yet changed the boot_val default of -1, just let it be.
	 * Autovacuum will look to maintenance_work_mem instead.
	 */
	if (*newval == -1)
		return true;

	/*
	 * We clamp manually-set values to at least 1MB.  Since
	 * maintenance_work_mem is always set to at least this value, do the same
	 * here.
	 */
	if (*newval < 1024)
		*newval = 1024;

	return true;
}

static bool
check_max_worker_processes(int *newval, void **extra, GucSource source)
{
	if (MaxConnections + autovacuum_max_workers + 1 +
				pgjob_max_workers + 1 +
				*newval > MAX_BACKENDS)
		return false;
	return true;
}

static bool
check_effective_io_concurrency(int *newval, void **extra, GucSource source)
{
#ifdef USE_PREFETCH
	double		new_prefetch_pages;

	if (ComputeIoConcurrency(*newval, &new_prefetch_pages))
	{
		int		   *myextra = (int *) guc_malloc(ERROR, sizeof(int));

		*myextra = (int) rint(new_prefetch_pages);
		*extra = (void *) myextra;

		return true;
	}
	else
		return false;
#else
	return true;
#endif							/* USE_PREFETCH */
}

static void
assign_effective_io_concurrency(int newval, void *extra)
{
#ifdef USE_PREFETCH
	target_prefetch_pages = *((int *) extra);
#endif							/* USE_PREFETCH */
}

static void
assign_pgstat_temp_directory(const char *newval, void *extra)
{
	/* check_canonical_path already canonicalized newval for us */
	char	   *dname;
	char	   *tname;
	char	   *fname;

	/* directory */
	dname = guc_malloc(ERROR, strlen(newval) + 1);	/* runtime dir */
	sprintf(dname, "%s", newval);

	/* global stats */
	tname = guc_malloc(ERROR, strlen(newval) + 12); /* /global.tmp */
	sprintf(tname, "%s/global.tmp", newval);
	fname = guc_malloc(ERROR, strlen(newval) + 13); /* /global.stat */
	sprintf(fname, "%s/global.stat", newval);

	if (pgstat_stat_directory)
		free(pgstat_stat_directory);
	pgstat_stat_directory = dname;
	if (pgstat_stat_tmpname)
		free(pgstat_stat_tmpname);
	pgstat_stat_tmpname = tname;
	if (pgstat_stat_filename)
		free(pgstat_stat_filename);
	pgstat_stat_filename = fname;
}

static bool
check_application_name(char **newval, void **extra, GucSource source)
{
	/* Only allow clean ASCII chars in the application name */
	char	   *p;

	for (p = *newval; *p; p++)
	{
		if (*p < 32 || *p > 126)
			*p = '?';
	}

	return true;
}

static void
assign_application_name(const char *newval, void *extra)
{
	/* Update the pg_stat_activity view */
	pgstat_report_appname(newval);
}

static bool
check_cluster_name(char **newval, void **extra, GucSource source)
{
	/* Only allow clean ASCII chars in the cluster name */
	char	   *p;

	for (p = *newval; *p; p++)
	{
		if (*p < 32 || *p > 126)
			*p = '?';
	}

	return true;
}

static bool
check_page_checksums(bool *newval, void **extra, GucSource source)
{
	if (*newval == page_checksums)
		return true;

	if (*newval == false)
		ereport(WARNING,
				(errmsg("Page checksum option cannot be re-enable after it is turned off!!!"),
				 errhint("If you disable them by mistake, make sure to re-enable them before restarting the node.")));
	else
		ereport(WARNING,
				(errmsg("Enabling page checksums may prevent the node from starting."),
				 errhint("Disable this option if you encounter any page checksum issues.")));
	return true;
}

static const char *
show_unix_socket_permissions(void)
{
	static char buf[8];

	snprintf(buf, sizeof(buf), "%04o", Unix_socket_permissions);
	return buf;
}

static const char *
show_log_file_mode(void)
{
	static char buf[8];

	snprintf(buf, sizeof(buf), "%04o", Log_file_mode);
	return buf;
}

#ifdef __AUDIT__
static const char *
show_alog_file_mode(void)
{
	static char buf[8];

	snprintf(buf, sizeof(buf), "%04o", AuditLog_file_mode);
	return buf;
}
#endif

#ifdef XCP
/*
 * Return a quoted GUC value, when necessary
 */
const char *
quote_guc_value(const char *name, const char *value, int flags)
{
	char *new_value;

	if (value == NULL)
		return value;

	/*
	 * An empty string is what gets created when someone fires SET var TO ''.
	 * We must send it in its original form to the remote node.
	 */
	if (!value[0])
		return "''";

	/*
	 * A special case for empty string list members which may get replaced by
	 * "\"\"" when flatten_set_variable_args gets called. So replace that back
	 * to ''.
	 */
	new_value = pstrdup(value);
	strreplace_all(new_value, "\"\"", "''");
	value = new_value;

	/* Finally don't quote empty string */
	if (strcmp(value, "''") == 0)
		return value;

	/*
	 * If the GUC rceives list input, then the individual elements in the list
	 * must be already quoted correctly by flatten_set_variable_args(). We must
	 * not quote the entire value again.
	 *
	 * We deal with empty strings which may have already been replaced with ""
	 * by flatten_set_variable_args. Unquote them so that remote side can
	 * handle it.
	 */
	if (flags & GUC_LIST_INPUT)
	   return value;

	/*
	 * Otherwise quote the value. quote_identifier() takes care of correctly
	 * quoting the value when needed, including GUC_UNIT_MEMORY and
	 * GUC_UNIT_TIME values.
	 *
	 * NOTICE: If the guc contains a identifier (not a list), there are some differents between
	 * postgresql mode and opentenbase_ora mode.
	 */
	if (ORA_MODE && str_val_contain_ident(name))
		return quote_identifier(value);
	else
		return quote_identifier_as_pg(value);
}

/*
 * Replace all occurrences of "needle" with "replacement". We do in-place
 * replacement, so "replacement" must be smaller or equal to "needle"
 */
static void
strreplace_all(char *str, char *needle, char *replacement)
{
	char	   *s;

	s = strstr(str, needle);
	while (s != NULL)
	{
		int			replacementlen = strlen(replacement);
		char	   *rest = s + strlen(needle);

		memcpy(s, replacement, replacementlen);
		memmove(s + replacementlen, rest, strlen(rest) + 1);
		s = strstr(str, needle);
	}
}
#endif
#ifdef __OPENTENBASE__
bool
set_warm_shared_buffer(bool *newval, void **extra, GucSource source)
{
	if (!g_WarmSharedBuffer)
	{
		WarmSharedBuffer();
		g_WarmSharedBuffer = true;
	}
	return true;
}
static const char *
show_total_memorysize(void)
{
	int32   size;
	static char buf[64];

	if (IsConnFromCoord())
		is_pooler_show_cmd = true;

	size = get_total_memory_size();
	snprintf(buf, sizeof(buf), "%d", size);
	return buf;
}
static const char *
show_global_trace_id(void)
{
	return GlobalTraceIdHistory;
}
#endif

#ifdef __OPENTENBASE_C__
static bool
check_query_mem(int *newval, void **extra, GucSource source)
{
	/* 0 indicates no memory control */
	if (IS_DISTRIBUTED_DATANODE)
	{
		*newval = 0;
		return true;
	}

	if (*newval <= 0)
	{
		if (max_query_mem != 0)
			*newval = max_query_mem;
		else
			*newval = 0;
		return true;
	}

	/*  We clamp manually-set values to at least 32MB. */
	if (*newval <= SIMPLE_QUERY_THRESHOLD)
	{
		*newval = SIMPLE_QUERY_THRESHOLD;
		return true;
	}

	/* Be limited by max_query_mem */
	if (max_query_mem != 0 && *newval > max_query_mem)
	{
		*newval = max_query_mem;
		return true;
	}

	return true;
}

static void
assign_query_mem(int newval, void *extra)
{
	if (max_query_mem != 0 && (newval > max_query_mem || newval == 0))
	{
		ereport(ERROR,
			(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
			 errmsg("query_mem must be less than max_query_mem (%d kB)",
					max_query_mem)));
	}
}

static bool
check_max_query_mem(int *newval, void **extra, GucSource source)
{
	/* 0 indicates no memory control */
	if (IS_DISTRIBUTED_DATANODE || *newval <= 0)
	{
		*newval = 0;
		return true;
	}

	/*  We clamp manually-set values to at least 32MB. */
	if (*newval < SIMPLE_QUERY_THRESHOLD)
		*newval = SIMPLE_QUERY_THRESHOLD;

	return true;
}

static void
assign_max_query_mem(int newval, void *extra)
{
	/* Set query_mem if needed */
	if (newval != 0 && (query_mem == 0 || newval < query_mem))
	{
		query_mem = newval;
	}
}

bool
validate_pgxc_plane_name(const char *value, int *retval)
{
	int i = 0;

	for (i = 0; i < lengthof(pgxc_plane_name_control_options); i++)
	{
		const struct config_enum_entry *entry = (&(pgxc_plane_name_control_options[i]));

		if (entry->name != NULL && pg_strcasecmp(value, entry->name) == 0)
		{
			if (retval != NULL)
			{
				*retval = entry->val;
			}

			return TRUE;
		}
	}

	if (retval != NULL)
	{
		*retval = (int) PGXCDefaultPlaneNameID;
	}

	return FALSE;
}

char *
pgxc_plane_name(PgxcPlaneNameId name_id)
{
	Assert(name_id >= OpenTenBase_Cluster && name_id <= OpenTenBase_Cluster_15);
	if (name_id >= OpenTenBase_Cluster && name_id <= OpenTenBase_Cluster_15)
	{
		return (char *)pgxc_plane_name_control_options[name_id].name;
	}

	return (char *)pgxc_plane_name_control_options[OpenTenBase_Cluster].name;
}

#endif

#ifdef _MLS_
static void assign_default_locator_type(const char *newval, void *extra)
{
	if (newval && newval[0] != '\0')
	{
        if ((strcmp(newval, "hash") != 0) 
            && (strcmp(newval, "shard") != 0) 
            && (strcmp(newval, "replication") != 0))
        {
            elog(ERROR, "invalid for default_locator_type, enum as shard/hash/replication");
        }
        
        g_default_locator_type = strdup(newval);
	}    
    
    return;
}

#endif

static bool
check_resource_group_bypass(bool *newval, void **extra, GucSource source)
{
	/* always return true in opentenbase */
	if (!ResGroupIsAssigned())
		return true;

	GUC_check_errmsg("SET resource_group_bypass cannot run inside a transaction block");
	return false;
}

static bool
check_enable_resource_group(bool *newval, void **extra, GucSource source)
{
	if (*newval && enable_resource_queue)
	{
		GUC_check_errmsg("enable_resource_group cannot be set on when enable_resource_queue is on");
		return false;
	}

	return true;
}

static void
assign_enable_resource_group(bool newval, void *extra)
{
	if (newval)
	{
		enable_resource_group = true;
	}
	else
	{
		enable_resource_group = false;
	}

	return;
}

static void
assign_resource_group_name(const char *newval, void *extra)
{
	if (newval && newval[0] != '\0')
	{
		resource_group_name = strdup(newval);
	}

	return;
}

static bool
check_resource_group_leader_coordinator(char **newval, void **extra, GucSource source)
{
	if (*newval == NULL || find_leader_cn_with_name(*newval) != NULL)
		return true;

	GUC_check_errmsg("resource_group_leader_coordinator should set to name of one existing coordinator");
	return false;
}

static bool
check_max_handles(int *newval, void **extra, GucSource source)
{
	if (max_handles == *newval)
	{
		return true;
	}

	if (!IS_PGXC_COORDINATOR)
	{
		*newval = 1;
		return true;
	}

	if (InterruptHoldoffCount || IsTransactionBlock() || GetGlobalCommitTimestamp() != InvalidGlobalTimestamp)
	{
		elog(WARNING,
			"cannot change the max_handles_per_node when the "
			"transaction not finish, before is %d, new val is %d",
			max_handles, *newval);
		*newval = max_handles;
		return true;
	}
	return true;
}

static void
assign_max_handles(int newval, void *extra)
{
	if (max_handles == newval)
		return;

	elog(LOG, "change the max_handles_per_node from %d to %d", max_handles, newval);

	ReInitHandles(newval);
}

static bool
check_unused_bool_guc_set(bool* newval, void** extra, GucSource source)
{
	ereport(WARNING,
			(errmsg("The logical code corresponding to the GUC has been removed."),
				errhint("Please remove the parameter settings related to this parameter from your business as soon as possible.")));
	return true;
}

static bool
check_unused_int_guc_set(int *newval, void **extra, GucSource source)
{
	ereport(WARNING,
			(errmsg("The logical code corresponding to the GUC has been removed."),
				errhint("Please remove the parameter settings related to this parameter from your business as soon as possible.")));
	return true;
}


static bool
check_is_upgrade(bool* newval, void** extra, GucSource source)
{
	switch (source)
	{
			case PGC_S_DYNAMIC_DEFAULT:
			case PGC_S_ENV_VAR:
			case PGC_S_ARGV:
				GUC_check_errmsg("inplace_upgrade GUC can only be set with SET command.");
				return false;
	
			case PGC_S_FILE:
				switch (currentGucContext)
				{
					case PGC_SIGHUP:
					case PGC_POSTMASTER:
						ereport(WARNING,
							(errmsg("inplace_upgrade GUC can not be set in postgresql.conf. Set to default (false).")));
						*newval = false;
						return true;
					default:
						GUC_check_errmsg("inplace_upgrade GUC can not be set in postgresql.conf.");
						return false;
				}	
			case PGC_S_DATABASE:
			case PGC_S_USER:
			case PGC_S_DATABASE_USER:
			case PGC_S_CLIENT:
			case PGC_S_OVERRIDE:
			case PGC_S_INTERACTIVE:
			case PGC_S_TEST:
				ereport(WARNING,
					(errmsg("inplace_upgrade GUC can only be set with SET command.  Set to default (false)"
							".")));
				*newval = false;
				return true;
	
			case PGC_S_DEFAULT:
			case PGC_S_SESSION:
				if (*newval && upgrade_mode == NON_UPGRADE)
				{
					GUC_check_errmsg("Can not set inplace_upgrade to true while not performing upgrade.");
					return false;
				}
				return true;
	
			default:
				GUC_check_errmsg("Unknown GUC source for setting inplace_upgrade.");
				return false;
		}
}

static void
assign_inplace_upgrade(const bool newval, void* extra)
{
	if (newval)
	{
		XactReadOnly = false;
		default_rel_store = RELSTORE_ROW;
	}
}

static bool
check_default_transaction_read_only(bool* newval, void** extra, GucSource source)
{
	if (*newval == false && upgrade_mode == INPLACE_UPGRADE)
	{
		ereport(WARNING,
				(errmsg("default_transaction_read_only GUC can not be set to false during inplace upgrade. Set to true.")));
		*newval = true;
	}
	return true;
}

static bool
check_and_assign_catalog_oids(List* elemlist)
{
	bool isshared = false;
	bool needstorage = false;
	Oid relid = InvalidOid;
	Oid comtypeid = InvalidOid;
	Oid toastrelid = InvalidOid;
	Oid indexrelid = InvalidOid;

	if (list_length(elemlist) != CATALOG_OID_LIST_LENGTH)
		return false;

	if (!parse_bool((char*)(list_nth(elemlist, 1)), &isshared) ||
		!parse_bool((char*)(list_nth(elemlist, 2)), &needstorage) ||
		(relid = atooid((char*)(list_nth(elemlist, 3)))) >= FirstBootstrapObjectId ||
		(comtypeid = atooid((char*)(list_nth(elemlist, 4)))) >= FirstBootstrapObjectId ||
		(toastrelid = atooid((char*)(list_nth(elemlist, 5)))) >= FirstBootstrapObjectId ||
		(indexrelid = atooid((char*)(list_nth(elemlist, 6)))) >= FirstBootstrapObjectId)
		return false;

	new_catalog_isshared = isshared;
	new_catalog_need_storage = needstorage;
	inplace_upgrade_next_heap_pg_class_oid = relid;
	inplace_upgrade_next_pg_type_oid = comtypeid;
	inplace_upgrade_next_toast_pg_class_oid = toastrelid;
	inplace_upgrade_next_index_pg_class_oid = indexrelid;

	if (isshared)
	{
		MemoryContext oldcxt = MemoryContextSwitchTo(TopMemoryContext);
		if (OidIsValid(relid))
			new_shared_catalog_list = lappend_oid(new_shared_catalog_list, relid);
		if (OidIsValid(toastrelid))
			new_shared_catalog_list = lappend_oid(new_shared_catalog_list, toastrelid);
		if (OidIsValid(indexrelid))
			new_shared_catalog_list = lappend_oid(new_shared_catalog_list, indexrelid);
		MemoryContextSwitchTo(oldcxt);
	}

	return true;
}

static bool
check_and_assign_proc_oids(List* elemlist)
{
	Oid procid = InvalidOid;

	if (list_length(elemlist) != PROC_OID_LIST_LENGTH)
		return false;

	if ((procid = atooid((char*)(list_nth(elemlist, 1)))) >= FirstBootstrapObjectId)
		return false;

	inplace_upgrade_next_pg_proc_oid = procid;

	return true;
}

static bool
check_and_assign_type_oids(List* elemlist)
{
	Oid typeoid = InvalidOid;
	Oid arraytypeid = InvalidOid;
	char typtype = TYPTYPE_BASE;

	if (list_length(elemlist) != TYPE_OID_LIST_LENGTH)
		return false;

	if ((typeoid = atooid((char*)(list_nth(elemlist, 1)))) >= FirstBootstrapObjectId ||
		(arraytypeid = atooid((char*)(list_nth(elemlist, 2)))) >= FirstBootstrapObjectId ||
		((typtype = *(char*)(list_nth(elemlist, 3))) != TYPTYPE_BASE && typtype != TYPTYPE_PSEUDO))
		return false;

	inplace_upgrade_next_pg_type_oid = typeoid;
	inplace_upgrade_next_array_pg_type_oid = arraytypeid;
	TypeCreateType = typtype;

	return true;
}

static bool
check_and_assign_namespace_oids(List* elemlist)
{
	Oid namespaceid = InvalidOid;

	if (list_length(elemlist) != NAMESPACE_OID_LIST_LENGTH)
		return false;

	if ((namespaceid = atooid((char*)(list_nth(elemlist, 1)))) >= FirstBootstrapObjectId)
		return false;

	inplace_upgrade_next_pg_namespace_oid = namespaceid;

	return true;
}

static bool
check_and_assign_general_oids(List* elemlist)
{
	Oid generalid = InvalidOid;

	if (list_length(elemlist) != GENERAL_OID_LIST_LENGTH)
		return false;

	generalid = atooid((char*)(list_nth(elemlist, 1)));
	inplace_upgrade_next_general_oid = generalid;

	return true;
}

static bool
check_inplace_upgrade_next_oids(char** newval, void** extra, GucSource source)
{
	char* rawstring = NULL;
	List* elemlist = NIL;
	char* objectkind = NULL;
	bool checkpass = false;

	if (!IsInplaceUpgrade && source != PGC_S_DEFAULT)
	{
		ereport(WARNING, (errmsg("Can't set next object oids while not performing upgrade.")));
		*newval = NULL;
	}

	if (*newval == NULL)
		return true;

	/* Need a modifiable copy of string */
	rawstring = pstrdup(*newval);
	/* Parse string into list of identifiers */
	if (!SplitIdentifierString(rawstring, ',', &elemlist))
	{
		/* syntax error in list */
		GUC_check_errdetail("List syntax is invalid.");
		pfree(rawstring);
		list_free(elemlist);
		return false;
	}

	objectkind = (char*)(list_nth(elemlist, 0));

	if (pg_strcasecmp(objectkind, "IUO_CATALOG") == 0)
		checkpass = check_and_assign_catalog_oids(elemlist);
	else if (pg_strcasecmp(objectkind, "IUO_PROC") == 0)
		checkpass = check_and_assign_proc_oids(elemlist);
	else if (pg_strcasecmp(objectkind, "IUO_TYPE") == 0)
		checkpass = check_and_assign_type_oids(elemlist);
	else if (pg_strcasecmp(objectkind, "IUO_NAMESPACE") == 0)
		checkpass = check_and_assign_namespace_oids(elemlist);
	else if (pg_strcasecmp(objectkind, "IUO_GENERAL") == 0)
		checkpass = check_and_assign_general_oids(elemlist);
	else
	{
		GUC_check_errdetail("String of object kind is invalid.");
		pfree(rawstring);
		list_free(elemlist);
		return false;
	}

	pfree(rawstring);
	list_free(elemlist);

	if (!checkpass)
	{
		GUC_check_errdetail("Format of object oid assignment is invalid.");
		return false;
	}
	else
	{
		return true;
	}
}

void
set_sql_mode(DatabaseSQLMode new_val)
{
	sql_mode = new_val;
}


static inline bool
str_val_contain_ident(const char *name)
{
	return strcmp(name, "search_path") == 0 ||
		strcmp(name, "default_tablespace") == 0 ||
		strcmp(name, "temp_tablespaces") == 0 ||
		strcmp(name, "role") == 0 ||
		strcmp(name, "session_authorization") == 0 ||
		strcmp(name, "session_replication_role") == 0;
}

struct config_generic *
get_guc_value(const char *name)
{
	const char **key = &name;
	struct config_generic **res;

	/*
	 * By equating const char ** with struct config_generic *, we are assuming
	 * the name field is first in config_generic.
	 */
	res = (struct config_generic **) bsearch((void *) &key,
											 (void *) guc_variables,
											 num_guc_variables,
											 sizeof(struct config_generic *),
											 guc_var_compare);
	if (res)
		return *res;

	return NULL;
}

void
get_set_command(List *param_list, StringInfo command, bool *set_search_path, uint64 start_cid)
{
	ListCell		   *lc;
	char 				search_path_value[512] = {0};
	const char 			*p = NULL;
	const char 			*pre = NULL;
	const char			*tmp = NULL;
	int 				index = 0;
	int 				count = 0;
	bool				need_set_quota = false;

	if (param_list == NIL)
		return;

	foreach(lc, param_list)
	{
		ParamEntry *entry = (ParamEntry *) lfirst(lc);
		const char *value = NameStr(entry->value);
		bool  local = entry->local;

		if (enable_distri_print)
			elog(LOG, "get_set_command 1: %s %s local %d guc_cid %lu start_cit %lu",
				 NameStr(entry->name), NameStr(entry->value), entry->local,
				 entry->guc_cid, start_cid);

		if (entry->guc_cid <= start_cid)
			continue;

		if (entry->reset)
		{
			appendStringInfo(command, "SET %s %s TO DEFAULT;", local ? "LOCAL" : "",
							 NameStr(entry->name));
			continue;
		}


		if (strlen(value) == 0)
			value = "''";

		value = quote_guc_value(NameStr(entry->name), value, entry->flags);

		if (enable_distri_print)
			elog(LOG, "1: %s %s local %d", NameStr(entry->name), NameStr(entry->value), entry->local);

		/* replace $user to "$user" */
		if (strcmp(entry->name.data, "search_path") == 0)
		{
			if (enable_distri_print)
				elog(LOG, "2: %s %s local %d", NameStr(entry->name), NameStr(entry->value), entry->local);

			for (p = value, pre = value; *p != '\0'; p++)
			{
				if (*p == '$')
				{
					if (*pre != ' ' && *pre != ',' && *pre != '"' && pre != value)
					{
						/* no need to add quota before $ */
					}
					else
					{
						bool break_loop = false;
						/* find out match $user exactly or not */
						for (tmp = p+1, count = 0; *tmp != '\0' && count <= 4; tmp++, count++)
						{
							switch (count)
							{
								case 0:
									if (*tmp != 'U' && *tmp != 'u')
									{
										break_loop = true;
									}
									break;

								case 1:
									if (*tmp != 'S' && *tmp != 's')
									{
										break_loop = true;
									}
									break;

								case 2:
									if (*tmp != 'E' && *tmp != 'e')
									{
										break_loop = true;
									}
									break;

								case 3:
									if (*tmp != 'R' && *tmp != 'r')
									{
										break_loop = true;
									}
									break;

								case 4:
									if (*tmp == ' ' || *tmp == ',')
									{
										need_set_quota = true;
									}
									break;
								default:
									break_loop = true;
							}
							/* NOT match */
							if (break_loop)
							{
								break;
							}
						}

						if (count == 4 && *tmp == '\0' && !break_loop)
						{
							need_set_quota = true;
						}
					}


					if (need_set_quota)
					{
						search_path_value[index++] = '"';
					}

				}

				if (need_set_quota && (' ' == *p || ',' == *p))
				{
					search_path_value[index++] = '"';
					need_set_quota = false;
				}

				search_path_value[index++] = *p;
				pre = p;

				/* length safety check. */
				if (strlen(search_path_value) + 3 > sizeof(search_path_value))
				{
					break;
				}
			}
			/* case like $user\0 (reach end of string) */
			if (need_set_quota)
			{
				search_path_value[index++] = '"';
			}
			appendStringInfo(command, "SET %s %s TO %s;", local ? "LOCAL" : "",
							 NameStr(entry->name), search_path_value);
			if (set_search_path != NULL)
				*set_search_path = true;
		}
		else
		{
#ifndef __OPTIMIZE__
			if (strcmp(entry->name.data, "opentenbase_test_flag") == 0)
			{
				char* test_flag = get_valid_opentenbase_test_flag();
				/* exclude empty string, which is "\"\"" */
				if (strcmp(test_flag, "\"\"") != 0)
				{
					appendStringInfo(command, "SET %s %s TO %s;", local ? "LOCAL" : "", NameStr(entry->name), test_flag);
				}
				pfree(test_flag);
			}
			else if (strcmp(entry->name.data, "restrict_nonsystem_relation_kind") == 0)
				quote_restrict_rel_kind(command, NameStr(entry->name), value, local);
			else
			{
				appendStringInfo(command, "SET %s %s TO %s;", local ? "LOCAL" : "", NameStr(entry->name), value);
			}
#else
			if (strcmp(entry->name.data, "restrict_nonsystem_relation_kind") == 0)
				quote_restrict_rel_kind(command, NameStr(entry->name), value, local);
			else
				appendStringInfo(command, "SET %s %s TO %s;", local ? "LOCAL" : "",
			 	NameStr(entry->name), value);
#endif
		}
	}
}

List *
paramlist_delete_param(List *param_list, const char *name, bool local)
{
	ListCell   *cur_item;
	ListCell   *prev_item;

	prev_item = NULL;
	cur_item = list_head(param_list);

	while (cur_item != NULL)
	{
		ParamEntry *entry = (ParamEntry *) lfirst(cur_item);

		if (strcmp(NameStr(entry->name), name) == 0 && local == entry->local)
		{
			/* cur_item must be removed */
			param_list = list_delete_cell(param_list, cur_item, prev_item);
			pfree(entry);
			if (prev_item)
				cur_item = lnext(prev_item);
			else
				cur_item = list_head(param_list);
		}
		else
		{
			prev_item = cur_item;
			cur_item = lnext(prev_item);
		}
	}

	return param_list;
}

static void
quote_restrict_rel_kind(StringInfo command, char *name, const char *value, bool local)
{
	char *foreign_table_start = strcasestr(value, GUC_FOREIGN_REL_KIND);

	if (foreign_table_start)
	{
		size_t pre_end_pos;
		size_t post_start_pos;

		pre_end_pos = (size_t) (foreign_table_start - value);
		post_start_pos = pre_end_pos + strlen(GUC_FOREIGN_REL_KIND);

		/* Skip the double quotes in the pre section */
		if (pre_end_pos > 0 && value[pre_end_pos - 1] == '\"')
			pre_end_pos--;

		if (pre_end_pos > 0)
		{
			char *val_pre;

			val_pre = palloc(pre_end_pos + 1);
			memcpy(val_pre , value, pre_end_pos);
			val_pre[pre_end_pos] = '\0';
			appendStringInfo(command, "SET %s %s TO %s", local ? "LOCAL" : "", name, val_pre);
			appendStringInfo(command, "\"%s\"", GUC_FOREIGN_REL_KIND);
			pfree(val_pre);
		}
		else
			appendStringInfo(command, "SET %s %s TO \"%s\"", local ? "LOCAL" : "", name, GUC_FOREIGN_REL_KIND);

		/* Skip the double quotes in the post section */
		if (strlen(value) - post_start_pos > 0 && value[post_start_pos] == '\"')
			post_start_pos++;

		if (strlen(value) - post_start_pos > 0)
			appendStringInfo(command, "%s", value + post_start_pos);

		/* Add comma */
		appendStringInfo(command, ";");
	}
	else
		appendStringInfo(command, "SET %s %s TO %s;", local ? "LOCAL" : "", name, value);
}

#include "guc-file.c"
